travel trailer ac freezing up

RV Air Conditioner Freeze Up – 10 Causes & How To Fix Them

Few things are as uncomfortable as staying in your RV without air conditioning, so finding out how to fix an RV air conditioner freeze up is a top priority if you find yourself in this situation.

With any repair, you first need to understand why the problem is occurring before you can go about fixing it.

We’ll cover the main causes of RV air conditioners freezing up and how to fix them in today’s guide.

Why Do RV Air Conditioners Freeze Up? 10 Main Causes

Here are the most common reasons why RV AC units freeze up:

• Dirty Condenser Or Evaporator Coils
• The A/C Unit Is Obstructed
• Outside Temp Is Too Low
• Dirty Air Filter
• Bad Thermostat
• Bad Flow Divider Or Baffle
• High Humidity
• Dislodged or Defective Freeze Sensor
• Weak Or Bad Capacitor
• Low Refrigerant Or Coolant

We’ll go through how to diagnose each of these RV AC problems and how to fix each one below.

Before we do any of these, we first need to defrost the RV AC unit.

How To Defrost Your RV Air Conditioner

We need to defrost the air conditioning unit in your RV before we can diagnose the problem, so let’s cover that process.

Fortunately, it’s a pretty easy one but can take a little time:

• Step 1: Remove the cover of your A/C unit inside your RV (you’ll probably need a screwdriver or small pry bar depending on the cover)
• Step 2: Turn the A/C fan on high setting (be sure not to turn the cooling function on, only the fan).
• Step 3: Put towels and a bucket below the air conditioner to catch drips of water while the unit defrosts.
• Step 4: Once the unit has defrosted and stopped dripping, let the unit dry out fully.  You can continue running the unit’s fan and you can even aim another small fan at the unit to speed up this process.

Problem 1: Dirty RV A/C Condenser Or Evaporator Coils

The most common reason why RV air conditioners freeze up is due to low airflow, and that’s caused by blockages in the condenser and/or evaporator coils.

Each set of coils has it’s own job: the evaporator coils remove the heat from the air, and the condenser coils move that heat outside.

These coils need to be cleaned regularly and if they aren’t, the coils have to work harder than usual to get the air cool inside your RV.

The dirt and gunk that forms on the coils block these processes from happening easily, and then ice will form on the coils since the system is working harder to cool the air.

How To Clean Your RV’s Evaporator And Condenser Coils

Before you start: gather your supplies.

You’ll need the following items to clean your AC coils on your RV:

• Screwdriver
• Soft Brush Or Cloth
• Spray Bottle
• Soap Or Detergent

Step 1: Locate The RV A/C Unit

Before you can clean anything, you first need to know where your AC unit is!  This is pretty easy, as most RV air conditioners are on the roof.  You should be able to see the condenser coils and evaporator coils once you get the housing off, which you can do with a screwdriver.

Step 2: Power Everything Off

Make sure to unplug your RV from power or turn off any generators and disconnect your batteries.

As a second option, you could just turn off the breaker for your A/C unit and remove the fuse while working on the A/C.

Either way, be certain that there’s no 110V or 12V power going to the air conditioner.

Step 3: Remove The RV Air Conditioner Unit Cover

Remove the screws covering your RV’s A/C unit, and put them somewhere safe so you don’t misplace them.

Most A/C units on RVs will have the evaporator coils in front and the condenser coils in back.

Safety tip: the sheet metal used for the housing can be sharp, so wear safety gloves .  Also, bees and wasps like to make nests in this housing, so be careful when taking it off.

Step 4: Vacuum The Air Conditioner Coils

Using a brush attachment, vacuum off any dirt and debris from the coils.  Be careful not to knock any of it into the openings that lead into the RV.

Step 5: Clean The RV AC Unit Coils

You can mix a solution of soap (like dish soap) and water in a spray bottle and spray down both sets of coils.

Let this solution set on the coils for a few minutes, then wipe them down with a cloth or brush, and vacuum them again to remove any stubborn debris you knocked loose.

Step 6: Rinse And Repeat

Spray the coils off with water and repeat the cleaning process if necessary – some of the debris and film can really get baked on to these coils and you might need to do this more than once.

Step 7: Take A Good Look

Inspect the coils and try to get as much gunk off as you possibly can – again, the better and cleaner the coils are, the better your RV’s A/C unit is going to perform.

Look for any damaged, warped, or bent fins on the coils – if you see a few you can fix them with needle nose pliers, a screwdriver, or small knife.

If you have a lot of fins that are in bad shape you can correct them with a fin comb . 

Step 8: Put Everything Back Together

While you’ve got everything pulled apart, go ahead and clean the inside and outside of the A/C unit housing with soap and water.

Put everything back together, restore power, and test your RV’s air conditioner to see if this did the trick.

Here’s a great video giving you a visual guide on how to clean off those RV AC coils:

Problem 2: A/C Unit Obstruction

Visually check the AC unit to see if there are any bird nests, animals, or heavy brush or debris physically surrounding the AC unit’s coils on the inside or outside of the housing.

If you’re parked under thick brush and it’s resting on or around the A/C unit, this can cause the RV air conditioner to freeze up due to lack of airflow – same for birds nests and animals.

Problem 3: The Outside Temp Is Too Low

Most RV air conditioners are not made to handle outdoor air temperatures lower than 65 degrees.

If you’re further cooling this already cool air, it can cause your RV AC unit to freeze up.

If you’re camping in temperatures lower than 65 degrees, simply turn the AC unit off and open the windows to keep cool at night.

Problem 4: Dirty RV A/C Unit Air Filter

The issues caused by a dirty or clogged air filter reduce air flow, which is the most common culprit of RV AC freeze ups.

You should be replacing your air filter annually, and cleaning it about once a month during seasons of heavy use.

You can get replacement ones cheaply and they’re quick to install.

How To Clean Your RV Air Conditoner’s Air Filter

This process is extremely simple:

• Step 1: Wipe any dirt or debris off your air filter
• Step 2: Wash with soap and water, let dry, and put air filter back
• Step 3: (Optional): Soak for 10-15 minutes in a 1:8 solution of vinegar and water

Check out this video on how to replace and clean your RV’s AC filter:

Problem 5: Bad Flow Divider Or Baffle

The baffle (or flow divider) in your RV’s air conditioner keeps the hot air coming in to the unit separate from the cold air blowing out of the unit.

If there is a leak between the two supplies, the unit can freeze over because the already cold air is being further cooled by the hot air inlet.

Check the baffle to make sure it’s properly positioned.

Once everything is reseated properly, you can take some HVAC foil tape to seal up any leaks and prevent this from being a future problem.

You can see this process here:

Problem 6: Broken Thermostat

If you’re constantly turning down your thermostat in your RV to keep the A/C working, the thermostat may be broken.

Note that this only applies to RV A/C units that actually have a thermostat control – if yours is strictly on/off and fan settings, you can rule this out.

If you have an older thermostat, it may be wise to change it since older ones are known to have a lot of issues with accurately reading temperatures anyway.

How To Check Your Thermostat Reading:

• Step 1: Check the temperature inside your RV with a thermometer
• Step 2: Compare that temperature to the temperature you have your AC set to
• Step 3: If these numbers aren’t the same, you have a thermostat that’s acting up.

If you are comfortable with minor electrical repairs, you should be fine doing a thermostat replacement.

Check out this video for a walkthrough on how to replace your RV thermostat:

If not, consult a local RV repair facility to have it taken care of.

Problem 7: RV Air Conditioner Freezing Up From High Humidity

Without getting too far into the weeds here, your RV’s air conditioner pulls moisture out of the air to cool it before blowing it into your cabin.

Considering that fact, the higher the humidity, the harder your A/C unit has to work to cool the air.

The more moisture in the air, the more moisture that can freeze on the coils – simple as that.

The best way to combat this is to run your A/C unit on the high setting to keep the air flowing at a faster rate, or consider getting a small humidifier if you’re consistently camping in humid climates.

Opening your ceiling vents for 15-20 minutes at a time should also help mitigate this on particularly hot or humid days.

Problem 8: Freeze Sensor Is Bad Or Out Of Place

Some RV’s cooling units come with a freeze sensor that’s installed on the evaporator coil fins.

This sensor “sees” ice and shuts off the compressor so that the warmer air can defrost them or reverse the unit depending on the mode and model of your AC unit.

If the sensor is misplaced, fallen off, or is defective, it will no longer prevent your RV air conditioner freezing up.

Check to make sure that the sensor is placed about halfway up the evaporator coils and not dangling freely.

If it is placed correctly, consider replacing it as they usually run about $30-$50, so this could be a cheap fix for you.

This video does a great job on showing you how to replace or reseat an RV freeze sensor:

Problem 9: Weak Capacitor

The fan capacitor is very important because when it fails or malfunctions, the blower motor (which blows cool air into your RV) cannot start.

If the A/C compressor is running but the fan is not moving that cooled air away from the unit, the coils can freeze up.

Additionally, a weak or failed capacitor can eventually cause the compressor not to kick on at all, which will mean you have no A/C in your RV.

You can test the capacitor with a multimeter to see if the capacitor is bad or failing, and replace if you are comfortable doing so.  If not, take it to an RV service center to have this done.

Problem 10: Low Refrigerant Or Coolant

This is not a common issue, but there is the potential that the A/C unit in your RV is freezing up because it’s low on refrigerant.

This is rare, unless there’s a pinhole leak in your system somewhere caused by corrosion or vibration.

RV AC systems are called closed-loop systems, so there’s nowhere for you to add refrigerant yourself anyway.

Have this checked by an RV service center as a last resort.

How To Prevent Your RV Air Conditioner Freezing Up

Follow these tips to prevent your RV’s AC from freezing up:

Clean Your Return Air Vents And Filters

As your RV’s A/C unit pulls hot air in from outside, it can suck in animal hair, dust, and dirt, which will clog the air filters and eventually the coils, leading to an overworked unit that freezes up.

Park In The Shade

The lower the outside air’s temperature is, the less work your RV’s air conditioner has to do.  The air inside your RV will stay cooler longer too, keeping you more comfortable and making sure your RV’s air conditioner runs efficiently.

Switch To LED Lighting

LED lighting is cheap, easy to install, and puts off less heat than traditional lighting, which affects the temperature of the air inside your RV and also affects how often or hard your AC unit has to run to cool everything.

Why Does RV Air Conditioner Freeze Up? Conclusion

We hope you’ve followed this guide and were able to get the air conditioning in your RV working again.

Were there any extra tricks you tried or tips you have for others going through the process?  Let us know in the comments below.

While you’re here, check out our guides on the best RV outdoor kitchen mods and how to get through an RV one night freeze for more great RVing tips.

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Is Your RV AC Freezing Up? Here’s What To Do

Published on May 25th, 2023 by Chelsea Gonzales

What Causes an RV AC to Freeze Up and How to Fix It

The warmer months are here, and that means more time spent out in your RV. It also means you’re probably going to be using your RV air conditioner to keep cool. Unfortunately, this time of year is when a lot of people notice their RV AC freezing up.

Sometimes this is a one-time event caused by an excess of humidity in the air and doesn’t require any repairs at all. However, if it happens over and over again, there’s likely a reason behind the freeze-ups, and you will definitely want to get to the bottom of it and fix the problem.

Luckily, most of these fixes are fairly straightforward and inexpensive. The list below includes all of the things we recommend doing to stop your RV AC freezing up issues. Use these so you can fully enjoy the spring and summer in your travel trailer or motorhome. 

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How to defrost an rv ac.

Before we jump into the various potential causes and their fixes, let’s talk about how to defrost a frozen RV AC unit. This is a super easy process, but it can get a little bit messy, so be prepared to do some cleanup.

First, remove the plastic AC cover found on the inside of the RV. (Don’t lose any of the screws!) Once the cover is removed, turn on the fan of your AC unit, but make sure the cooling feature is turned off. This will pull warm air through the unit, melting any ice that has built up. 

Of course, melted ice is water, and that water will need to go somewhere—and this is where the mess comes in. Ideally, all that water would be caught by the AC drip pan. However, it’s usually so much that it just can’t handle it all. In this case, it ends up making its way into the RV and onto the floor below. We recommend placing a bucket under the unit while running the fan in order to catch the falling water.

When you feel confident that the unit has been completely defrosted, let it sit for several hours to dry. 

Too much humidity

As mentioned before, one reason for RV AC freezing up issues is simply too much humidity in the air. If your unit freezes up once and never again, this was likely the cause.

If it freezes up every time you visit a humid place, you might consider the possibility that one of the other causes below is working in conjunction with this extra moisture to cause a problem. Running a dehumidifier in the RV can help with this. However, you will also want to look into other possible causes just to be safe. 

Dirty air filter

Air conditioners need airflow to function properly. Low airflow will cause RV AC freezing up problems. One of the most common reasons for low airflow is a dirty air filter. These filters should be cleaned regularly—as often as every two weeks if the AC is being run daily—but many RV owners fail to do this bit of maintenance. 

Fortunately, this is an incredibly easy fix, as it only requires a quick filter cleaning and replacement. 

Dirty coils

The next thing to check would be the condenser and evaporator coils. If these are dirty, heat can’t escape properly. This means the unit has to work extra hard to put out cool air. Something that will eventually lead to problems with the RV AC freezing up. 

Good news! A brief cleaning should solve the problem.

To clean your condenser and evaporator coils, you will need a screwdriver, a shop vac, a spray bottle full of soapy water, and a soft brush.

Start by unplugging the RV, turning off the generator, and disconnecting the batteries to ensure that no power can get to the AC unit. Once this is done, you can remove the shroud over your AC unit by removing the screws and pulling up on the cover.

With this done, you should be able to see the condenser coils at the back of the unit, as well as the metal housing that contains the evaporator coils. Find the screws holding the housing in place, remove them, and carefully remove the housing. Make sure not to damage the gasket or cut your hands.

Now all coils should be exposed and you can start the cleaning process. Begin by using your shop vac to very carefully vacuum away as much dirt and dust as possible. The soft brush attachment can be very useful during this step. 

Finally, use your soapy water in a spray bottle to get the coils nice and wet, as well as remove any dirt that might be lodged in the crevices. Let the water sit for a few minutes before gently wiping the coils down with a cloth. 

Inspect the coils for any bent fins and straighten them out using a knife or fin comb. Once your fins are all straight, let the unit dry completely and then replace the metal housing and shroud.

Bad flow divider

Another cause of RV AC freezing up problems? A bad flow divider. This is the divider between the hot air intake and the cold air output. The divider can move around while driving. This leaves a poor seal and allowing air to seep from one side to the other. As a result, the AC unit thinks the air it is putting out isn’t cold enough, leading it to work harder and eventually freeze. 

To fix this issue, you will need to reposition the flow divider and create a seal. Hold the divider in place using HVAC foil tape. This video is a great example of this quick and easy fix. 

Broken thermostat

So far, every problem we’ve listed has been super easy to take care of with no new parts. If none of these fixes the problem and your AC unit is connected to a wall-mounted thermostat, the next thing to check is that thermostat. Unfortunately, if your problem is a broken thermostat, you’re looking at a slightly more difficult and more expensive job.

First, you will need to check if your thermostat is bad. To do this, check the temperature of your rig using a thermometer and compare it to the temperature reading on the thermostat. If they match or are very close, the thermostat is likely not your problem. If you get a different reading, you are probably onto something.

This particular job is harder than the jobs listed above. However, it isn’t incredibly difficult if you have experience with minor electrical work. This video shows you how to do the job. If you don’t have experience with this, hiring an RV tech might be a better option. 

Low refrigerant

The final thing that could cause RV AC freezing up issues is low refrigerant. This is actually highly unlikely because RV air conditioners are factory sealed, meaning no refrigerant should get out. However, it is possible to develop a leak. 

If you do find that leaking has occurred and that it’s the source of your problem, you will be looking at buying a new unit in order to fix the issue. This is because these closed-loop systems don’t allow for more refrigerant to be added. Once it’s gone it’s gone, and the AC is no longer useful.

Track your RV maintenance

Make sure you keep track of all your RV maintenance and repairs with an online tool such as RV LIFE Maintenance . Not only can you keep all of your documents in one place, but you’ll also receive timely reminders when maintenance is due to help you avoid costly repairs and potentially serious accidents.

Related articles:

• RV Air Conditioner Maintenance Must Do’s
• RV Air Conditioning Maintenance Tips That You Should Know

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Mar 21, 2023

Why Is My Camper A/C Freezing Up?

One common maintenance mistake that RV owners make is not taking the time to properly care for their air conditioning system. To keep the airflow cool and constant in your rig, especially on those scorching hot summer days, it’s important to keep an eye on your A/C unit and inspect it regularly.

If you landed on this post, you may be wondering, “Why is my RV A/C freezing up?” Great question! You more than likely have an airflow issue on your hands. The last thing you want to do is ignore the problem. When your air conditioner is stressed, it’s a good idea to immediately start troubleshooting the problem, otherwise you could end up with a premature A/C failure. And that’s no fun in the summertime

What Does It Mean for an Air Conditioner To “Freeze Up”?

Your RV air conditioner works by taking in the hot air from the inside of your RV and circulating it past an evaporator coil. As the refrigerant inside the evaporator coil converts to gas, heat from the indoor air is absorbed into the refrigerant, and the humidity condenses. The chilled air is then blown back into your RV while the condensed moisture is directed out of the A/C unit.

If your air conditioner is in need of service or routine maintenance, this process may not go as smoothly as it should. The condensed humidity or moisture can actually freeze on the evaporator coil, limiting the coil’s ability to chill and expel the cooled air back into the room. This makes your system work in overdrive to keep the inside of your RV cool, which causes ice build-up. See how it’s all interconnected?

With this in mind, let’s take a look at the most common reasons your camper A/C may be freezing up.

Common Problems that Cause Camper A/C Freeze-Ups

Freeze-ups are more than likely the result of your A/C unit getting poor or improper airflow. This can happen for a variety of reasons, including but not limited to:

•   Dirty evaporator and condenser coils
•   Dirty air filters
•   A poorly sealed or misaligned baffle (or flow divider)
•   Low refrigerant / coolant
•   A broken RV A/C thermostat
•   High humidity
•   An improperly sized unit

The good news is that each of these issues can be fixed if you follow the correct procedures. Read on to find out how you can fix these common camper freeze-up problems and how to avoid them in the future.

Camper A/C Freeze-Up Problem #1: Dirty Evaporator & Condenser Coils

The first step to ensuring your RV A/C unit is getting proper airflow is to make sure your evaporator and condenser coils are clean. These coils are fundamentally important for proper A/C function. If the coils are dirty, it is taxing for your unit to perform the heat exchange process efficiently. Keeping these coils clean ensures your air conditioner won’t overwork itself.

How to Clean RV A/C Coils

Evaporator and condenser coils are located inside your rooftop air conditioner, underneath the shroud. You have to go a step further to get to the evaporator coils, as they are located underneath a sheet metal housing, plastic cover or a molded polystyrene foam cover. Even so, these coils are fairly easy to access and clean using the steps below.

You’ll need a screwdriver or screw gun, vacuum with a soft brush attachment, mild detergent mixed with warm water in a spray bottle and a soft-bristled brush or soft cloth.

Step 1:  Shut off the A/C unit

It’s extremely important to shut off your air conditioner to avoid injury while you tinker with the inner workings. Either unplug your RV from shore power, turn off your generator, then disconnect the batteries or turn off the breaker that leads to the air conditioner. Whichever method you choose, just make sure there isn’t any 12V or 110V power running to your A/C.

Step 2:  Remove the shroud

There should be a few screws that hold your rooftop air conditioning unit in place. Remove the screws using a screwdriver or screw gun and set them aside to remove the shroud. Now that the shroud is removed, you should be able to see the condenser coils and the sheet metal housing, plastic or polystyrene foam cover for the evaporator coils. Remove the housing or cover to gain access to the evaporator coils.

Step 3:  Vacuum the coils

Block any openings that lead down into your RV. This will prevent dust, dirt and debris from wafting around inside your rig.

Then, using a soft brush vacuum attachment, gently vacuum around your coils being careful not to bend or break any of the aluminum components. Bent fins can lead to reduced cooling performance and efficiency! Also, exercise caution around the fins as they may be sharp.

Step 4:  Clean the coils

While there are various air conditioner cleaning agents on the market, you can still get a good clean using a mild household detergent and warm water in a spray bottle. Use this mixture to spray down the coils and let them sit for a few minutes, giving the cleaner time to loosen any dirt or buildup. Next, use a soft, non-abrasive brush or cloth to wipe down each coil. For good measure, vacuum the coils again to pick up any debris that you knocked loose.

You may need to repeat this step multiple times if your condenser and evaporator coils were especially dirty due to lack of maintenance or environmental factors.

You'll also want to be mindful of temperature sensing bulbs and the thermistor freeze control sensor. Take note of their location, and make sure that they are clean using a soft bristle brush. The thermistor, if in the incorrect location, could cause evaporators to freeze up prematurely. In most cases, the thermistor should be in the fins of the evaporator, one inch from the bottom on the left side.

Step 5:  Inspect all coils

Now that your coils are clean and you can see what you’re working with, it’s time for an inspection. As we mentioned above, bent aluminum fins can lead to poor A/C efficiency, so you want to make sure you don’t have any bent, damaged or broken components inside your unit. If you notice you have some bent fins, you’ll want to purchase a fin straightener tool (usually $20 or less) to help reorient the fins in the correct direction.

Step 6:  Reassemble the air conditioner

As long as all your coils are dry, you can reattach the sheet metal housing or cover for the evaporator coils. Before you get too enthusiastic about putting the shroud back on, it’s a great time to clean it! Using soap, water and a scrub brush or cloth, give the shroud a good clean, and dry it before reattaching it to the roof with the screws you set aside earlier. (Hopefully you didn’t lose them!)

Note: You might see that some insect friends have made a home inside your shroud. This is normal. Carefully remove any nests while you’re cleaning. It’s a good idea to regularly inspect your rooftop A/C unit for these nests and remove them as necessary. Also, be sure to clean your air conditioner coils monthly if you use your RV full-time or seasonally if you’re a part-timer.

Camper A/C Freeze-Up Problem #2: Dirty Air Filters

Another common reason why your camper A/C may be freezing up is dirty air filters. It all comes back to airflow. A dirty or clogged air filter inhibits how efficiently your air conditioner can push out cool air. To maintain cooling performance, you’ll want to clean or replace your air filter at least once per month.

How to Clean RV Air Conditioner Filters

There are basically two different types of air filters your unit can have: disposable and reusable / washable. Disposable air filters are easy to change out. All you need to do is purchase a new one that’s the correct size for your RV A/C unit, swap it out with the old filter, then throw the old one away.

Reusable air filters require a few more steps but are also more sustainable than their disposable counterparts. Use the following step-by-step instructions for cleaning your dirty RV air conditioner filter. To get started, you’ll need a screwdriver, vacuum, cold water and a mild detergent or vinegar.

The last thing you want is for dusty air to circulate through your A/C unit and your RV. Shut off the air conditioner to avoid this.

Step 2:  Remove the air filter

Using a screwdriver, loosen the screws on the rooftop air conditioner cover from inside your coach. This should expose the air filter enough for you to pop it out of place.

Note: Some filters are held in with a clip-in style access door. You can easily pop these out of place without tools.

Step 3:  Clean the filter

If you’ve kept up with air conditioner maintenance, chances are your air filter just needs a light clean. Vacuum up any visible dust or debris, then use cold water and a mild detergent to clean the air filter. If your air filter needs a little more TLC, or there are signs of mold and mildew, you’ll want to break out the white vinegar for a deeper clean. Soak the air filter in a one-part vinegar, one-part water solution for no more than 30 minutes. Never use bleach!

Whichever way you choose to clean the filter, you’ll need to make sure you rinse it thoroughly with clean water after it’s been soaked in cleaning solution. For this step, feel free to use a sink faucet or hose, but never use a power washer — they are simply too strong for the delicate air filter material.

Step 4:  Let it dry

You’ll want to make sure your air filter is completely dry before returning it to its housing. This may take several hours, so it’s best to do this overnight.

Step 5:  Reinstall the filter

Return the filter to its housing, and reinstall the cover using screws and a screwdriver (or clip it back into place). Don’t forget to turn your A/C system back on to enjoy clean, fresh air!

Camper A/C Freeze-Up Problem #3: A Poorly Sealed or Misaligned RV A/C Baffle (Flow Divider)

A baffle, also called a flow divider, keeps the hot air and cold air in an A/C unit separated. If this component is poorly sealed or misaligned, the cold air outlet could leak into the hot air inlet. This means that the A/C unit will take the already-chilled air and try to cool it even further, causing ice to form. To fix this, simply reposition the baffle and seal it using HVAC foil tape.

Camper A/C Freeze-Up Problem #4: Low Refrigerant

Unless you have a leak somewhere, you shouldn’t be losing refrigerant, as this is not something you should be topping off regularly or can even get access to. If you think you have a refrigerant leak, we highly recommend getting your A/C unit inspected by a professional.

Camper A/C Freeze-Up Problem #5: Broken Thermostat

You shouldn’t have to melt or freeze in your RV! Thermostats can go bad due to dust and wiring issues. If you have an older RV and notice that your air conditioner only works by constantly turning down the thermostat or your inside temperature doesn’t match your thermostat reading, it might be time for a replacement. This requires doing some minor electrical work, so if you aren’t comfortable handling a DIY electrical job, leave it to a professional.

Camper A/C Freeze-Up Problem #6: High Humidity

This is a factor that’s somewhat out of your control, so here’s what you need to know: your A/C unit has to work extremely hard to keep up when there’s a lot of humidity in the air. In humid climates, the moisture in the air can overload your air conditioning system. If the fan is running on low, water can start to freeze on the coils.

To avoid this, run your fan on high so that the moisture has less time to settle on the coils and freeze over. You can also open your roof vents for limited amounts of time (no more than 20 minutes a few times a day) to help the hot air and moisture escape your RV.

If you love more humid climates like the Everglades in Florida and just can’t stay away, you may want to invest in a small dehumidifier. After all, spending the money on a dehumidifier is much cheaper than replacing a full rooftop air conditioner that got overloaded to the point of its untimely demise.

Camper A/C Freeze-Up Problem #7: Improperly Sized Unit

Lastly, the size of your RV A/C unit should be determined by the size of your RV. A small unit installed in a large travel trailer or 5th wheel can take too long to cool down the entire space, and it might never fully get the job done. If you have too small of a unit installed on your RV, which isn’t likely unless you did an aftermarket install yourself, you could be creating an unnecessary draw on your power resources. You could also be overworking your A/C unit which, as you’ve learned throughout this post, can cause an RV air conditioner to freeze up.

The fix for this is pretty straightforward: buy a bigger unit if you’ve tried everything else to no avail.

How to Defrost an A/C Unit

So, now that you know why your camper A/C is freezing up, let’s focus on how to defrost it. With just a few simple steps and a little bit of time, your RV’s air conditioner will be back up and running like normal!

• Remove the ceiling A/C cover found on the inside of your RV using a screwdriver.
• Turn the air conditioner fan on and turn it up to its highest setting. Do not turn on the cooling setting. This should start to melt the ice, but it will take a few hours.
• Place a bucket on the floor underneath the unit to catch any water as the ice melts. You may want to spread out a towel underneath the bucket just in case the melting ice misses the bucket on the way down.
• Once the unit is fully defrosted, allow it to dry for several hours. It’s best to do this overnight.
• Reattach the A/C cover and turn the unit to its cooling setting.
• Enjoy the fresh air as it starts to circulate back through your rig!

Why Furrion RV Air Conditioners Are Resilient to Freezing Up

The BTU output of an A/C unit helps you understand its cooling performance. BTU stands for British Thermal Unit, and it's a measurement for energy. It takes one BTU to raise the temperature of a pound of water by 1°F, for example.

Many A/C manufacturers claim a standard 13.5K or 15K BTU, but there are differences in their true cooling capacity. If you're traveling in warmer environments, you want the unit with the highest possible true cooling capacity.

Furrion Chill® air conditioners have up to 50% greater cooling capacity than leading competitors, which means you can cool faster and to lower temperatures. Additionally, these A/C units automatically maintain the correct level of moisture in your air and can produce up to 25% dryer air than leading competitors. This creates a higher airflow cooling effect in summer and increases comfort.

The more efficient an A/C unit is, the more cooling power you get. A/C efficiency is measured in EER ratings; the higher the rating, the more efficient the unit is. For example, Furrion's 14.5K BTU A/C uses the same or less power as many 13.5K BTU A/Cs. This means the A/C doesn't need to run for as long to get the same cooling job done, saving on energy draw.

Shop RV air conditioning systems here!

Watch the Video to See How Furrion Air Conditioners Can Keep You Cool All Summer Long

Air Conditioner Troubleshooting

If you need additional help troubleshooting issues on your Furrion air conditioner, watch the below video from the Lippert Technical Institute

Bekka Oxley

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How to Keep Your RV AC From Freezing Up (Helpful Guide)

• June 21, 2019 /
• RV Air Conditioner /
• By R. Geraldi /

For most of the time you use your RV the air conditioner works well. You get lots of cool air, you are comfortable and you get a break from the heat. Life couldn’t get any better. Then your air conditioner takes a break.

How to Keep Your RV AC From Freezing Up: You have done your maintenance and your air conditioner still freezes up. The cause for this is that the freeze control dial may be set at the wrong level. A quick flip of the dial will get your air conditioner back on track.

This is the simplest solution to a very common problem.To find other fixes for when your RV AC unit freezes up, just continue to read our guide. It is filled with helpful information to keep you cool every time you are in your RV.

What Makes an RV Air Conditioner Freeze Up

There are several problems that can cause your RV’s air conditioner to freeze up and stop working. The first is that the air flow has somehow been lowered. This could be due to a dirty air filter.

You could replace the air filter and in a majority of cases this may all you need to do. In those other times, you may have to clean the coils as well. Another problem is that the coolant level has leaked out and the supply is too low.

In some cases you can add more coolant and bring the levels back up again. In other cases you may need to install bullet valves to get the coolant inside. Other problems include high humidity levels. Too much moisture will freeze your AC.

Dirty condenser and evaporator coils, a bad thermostat and a short circuit in your control board may also be the culprits. To solve these problems may take some cleaning and replacing bad parts.

RV ac Evaporator Coil Freezing Up

It is the evaporator coils that are responsible for cooling the hot air in your RV. When these become dirty, gather lint, or lots of dust gets on them, they stop working or they can freeze.

When this situation arises, you will need to remove the inside cover of your air conditioner and start cleaning. Using a brush with good bristles is the best way to get those coils clean.

Once you have finished cleaning, run the air conditioner on high. If you were successful, the ice should start to melt and water will start to drip over your floor. A bowl or a towel to stop the water from ruining your floors should be placed under the drips.

RV Air Conditioner Freezing up at Night

Part of the problem is the way RV air conditioners are made. They are not made to handle extreme cool temperatures. In fact, many are made to not work when the outdoor temperature reaches 65 degrees F or lower.

If your RV AC is freezing up at night it means that the night air is a lot lower than that benchmark. The way to solve this issue is to simply turn the air conditioner off when you go to bed and open the windows.

Brand New RV AC Freezing Up

It is possible that your new RV Ac is built with a cold switch. This is true with the newer Duo Therm AC. If your brand new RV air conditioner is freezing up it isn’t going to be dirt, etc., that is the problem.

Most likely, the control switch has been moved or placed in the wrong position. Having this switch in the right place is vital to proper operation. You will need to find out the correct position and move the switch there. Or have someone do it for you.

Also, you should check to make sure there is no continuity measurement when the outside temperature hits below 70 degrees F. It is also [possible that this switch has come loose and just needs to be properly secured again.

RV AC Freeze Sensor Location

The freeze sensor or temperature sensor is not that hard to find. Usually it is found on the evaporator fins. This just clips on and it is possible to jar them loose over time. To find it, just remove the inside cover of your air conditioner and look at the coils.

You can spot it as it will have 2 wires attached to it and it is about nickel or quarter size.

Excess Humidity Freezes Air Conditioners

This also is a common problem many RV owners experience. High humidity is a danger to most RV AC units because the air conditioner cannot drain away the moisture fast enough.

As the hot air is brought into the AC, the moisture can condense then freeze on the coils. Once they freeze, the air flow is blocked and your air conditioner cannot cool your RV.

One good way to solve this problem is to buy a mini dehumidifier and place it inside your RV. It should handle the excess moisture with ease as long as it is rated for the RVs interior size.

Getting a dehumidifier that is too small won't solve the problem and you have wasted good money.

Some Odd Causes

While it is rare, it does and can happen. One interesting cause for your AC unit freezing up comes from birds or other small animals building nests around your condenser coils.

A quick check and a fast removal time can solve your problem in a heart beat.

Some Final Comments

When your RV’s air conditioner starts to freeze on you is smart to look for the simplest answers first. Dirty coils, filters, cool nights and on occasion birds, can be the problem. These are fixed very quickly.

If these are not the problem then you might want to look at your control board for a short circuit or your thermostat to see if it has gone bad. These issues may take a little more time and a little more money to fix.

Your AC freezing problem is not that serious and can be handled by you or you can go to an expert to make sure the problem is solved correctly.

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6 Reasons Your RV Air Conditioner Freezes Up (With Fixes)

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On a recent road trip, our RV’s air condition froze at the worst possible time! It left us hot and grumpy in our RV while it defrosted and we scrambled to figure out what to do. After this, I looked up some handy fixes for these small air conditioners and ways of preventing this from happening again.

So, why do RV air conditioners freeze up? The top reasons an RV air conditioner freezes are :

• dirty evaporator and condenser coils
• bad flow dividers,
• dirty air filters
• high humidity
• broken thermostat
• low refrigerant

Turns out our poor air conditioner was just very dirty! This is the most common reason freezing occurs but there are several other possible culprits. Keep reading for how to clean your air conditioner coils as well as how to fix other issues you might face with your RV air conditioner.

Table of Contents

Defrosting Your Air Conditioner

Before we can look at reasons why your air conditioner froze in the first place we need to defrost the unit. Defrosting is easy to do but it’ll take some time and may get a bit messy.

• Inside the RV, remove the cover of the air conditioner unit using a screwdriver. Keep the screws in a safe place.
• Turn the air conditioner fan on – not the cooling feature. Use the high setting to melt the ice over a period of a few hours.
• Place the bucket beneath the air conditioner to catch dripping water as the unit defrosts. Place a towel under the bucket for extra protection.
• After the unit is defrosted, let it dry overnight with the bucket and/or towel still in place to catch residual moisture.

Ideally, the drip pan of the air conditioner will catch all the water as the ice defrosts but its better to be safe and have a backup plan in place.

Fix It Yourself RV Maintenance Course

The most costly parts of RV ownership are repairs and maintenance. That’s why I recommend learning to do your own RV repair and maintenance.

The  Fix It Yourself RV Maintenance Course  is the perfect way to learn how to do the most common repairs and maintenance on your RV. A Certified RV Technician wrote and filmed the course so you know the information is actually correct.

Plus it’s downloadable so you can access it from anywhere, even when boondocking in the middle of nowhere with no service.

Find out more about the best  RV Maintenance and Repair Course available !

Reason 1: Dirty Condenser or Evaporator Coils

The majority of RV A/C freeze ups are caused by low airflow, usually due to dirty evaporator or condenser coils. The coils in your air conditioner unit—evaporator coils and condenser coils—need to be cleaned regularly. If either set of coils is dirty the air conditioner needs to work harder to cool the air and transfer heat out of the RV. The evaporator coils take the heat out of the air in the RV and the condenser coils expel that heat to the outside.

If your coils are dirty then there is less surface area available to allow this heat exchanging process to occur so your unit will have to work extra hard to keep things cool. Ice will build up on the coils since the system has to work harder due to reduced airflow. Cleaning your dirty air conditioner coils is the first step to make sure the unit isn’t overworking itself.

How to Clean Evaporator and Condensor Coils

The evaporator and condenser coils are contained within the air conditioner up on your roof. The evaporator coils are at the front of the unit underneath the shroud and located within a sheet metal housing. The condenser coils should be visible once the shroud is removed or even before depending on the model. To get started you’ll need a screwdriver, shop vac, soap, spray bottle, and a soft brush.

Step 1: Power Off

Before you climb up on the roof you will want to disconnect power to the air conditioner, unplug your RV or turn off your generator then disconnect your batteries. Alternatively, you could pull the fuse and turn off the breaker for the air conditioner. Just make sure there is no 12V or 110V power going to your air conditioner (your air conditioner’s controller uses 12V)

Step 2: Remove Covers

Start by removing the shroud on your air conditioner. There should be a couple of screws holding it in place. Once the screws are removed keep them in a safe place and remove the shroud.

Pro Tip : Bees and Wasps like to make nests under the air conditioner shroud. Be careful when you are removing the cover especially if you see any buzzing around.

With the shroud removed you can now see the condenser coils at the back and sheet metal housing for the evaporator coils at the front. Unscrew and remove the sheet metal housing. You’ll want to be careful of the gasket since this seals out the elements from getting into your RV through the air conditioner. Gloves are also recommended when handling sheet metal since the edges are very sharp.

Step 3: Vacuum the Coils

Before vacuuming you’ll want to block any openings in the air conditioner that lead down into the RV. This is to prevent dirt, debris, and cleaner from getting inside.

Then, you’ll vacuum both the evaporator and condenser coils using a soft brush attachment on your shop vac. Be gentle when working on your coils as the aluminum fins can be easily bent.

Step 4: Clean the Coils

I hate using aerosols and chemical cleaners so I opted to use a mixture of soap and water in a spray bottle over an aerosol coil cleaner. Mix your soap with water in your spray bottle and spray down both the evaporator coils and the condenser coils.

Once the coils are good and wet let them sit for a few minutes then wipe down with a soft brush or cloth. Vacuum the coils again to pick up any debris that was dislodged.

Step 5: Repeat if Necessary

If your coils were exceptionally dirty or it’s been a long time since they were cleaned it’s worth repeating the process of vacuuming and washing the coils again.

Step 6: Inspect Coils

Now that your coils are clean it’s the perfect time to inspect them. Check for any bent or damaged fins. Bent fins will reduce the efficiency of your air conditioner since they will reduce the airflow.

If just a few are bent you can straighten them with a thin knife or screwdriver. If you notice multiple fins that are damaged you can pick up a fin comb like this one on Amazon.

Step 7: Dry and Reassemble

While you are letting your coils dry you should also clean the shroud. Just a quick scrub with soap and water should do the trick and it’s also the perfect time to dislodge any “guests” that have made a home under the shroud.

Once everything is dry you can reassemble your air conditioner. Reinstall the sheet metal shroud replacing the gasket if necessary. Then screw the shroud back in place. Hopefully, this will resolve your air conditioner freezing issue.

These steps might be time-consuming, but it is an easy process to clean evaporator coil in an RV air conditioner. Make sure you do this each year —or each season—depending on how often you use your RV.

Below is a helpful video about how to clean your evaporator coils.

Reason 2: Bad Flow Divider

As I said above the main cause of an air conditioner freezing is poor airflow, another cause of this is a bad flow divider. A flow divider, also known as a baffle, keeps the hot inlet air separate from the cold outlet air.

If the baffle is not positioned properly or poorly sealed the cold air outlet could be leaking into the hot air inlet which means the air entering the air conditioner is already cold and the unit would try to cool it even further causing ice to form.

This is usually an easy fix by repositioning the flow divider. You can seal the divider in place with some HVAC foil tape to prevent this from happening again in the future

Reason 3: Dirty Air Filters

Again we are talking about airflow. If the return air filters are dirty then the airflow intake will be reduced and could be causing your ac unit to freeze.

The air filter needs to be cleaned out monthly during RV season. Wipe any visible debris and wash with soap and water. If you have time, you can soak it for 10-15 minutes in a vinegar-and-water solution (one part vinegar to nine parts water) and leave it to air dry overnight before replacing it.

Be sure to replace your dirty air filters each year, as well. Small spaces like an RV are full of dirt and debris so having good air filters are important for you and your air conditioner’s health. The foam filters can be found in home improvement stores and on Amazon for as little as $5. You can purchase RV specific ones or simply cut standard ones down to size.

Here are some tips to using an air purifier to improve RV air quality.

Reason 4: There Is Too Much Humidity In The Air

Humidity is a huge factor in how well your RV air conditioner functions. This is because when the air is cooled the humidity condenses out of the air and should drain off your roof. Here’s why your RV air conditioner leaks when it rains.

On humid days, your ac unit is trying desperately to keep up, but the moisture in the air is too much for the evaporator coil to handle. If the fan is running on low the water can start to freeze on the coils since there is just so much moisture.

Running your fan on high in high humidity areas might just be enough to keep the air flow moving fast enough to prevent freezing from occurring. Otherwise, you can try cleaning your air conditioner and dirty air filters if you haven’t done so recently which might help.

If you enjoy hot and humid places, like Florida and Georgia, then investing in a dehumidifier will certainly help. A dehumidifier will take moisture/humidity out of the air so your air conditioner won’t have to work as hard.

Small dehumidifiers are also available for smaller spaces. For example, this highly-rated SEAVON dehumidifier , on Amazon, is marketed for RVs. Investing in a dehumidifier is cheaper than having your air conditioner serviced or being stuck in hot humid weather without an ac unit.

You can also open ceiling vents for a limited time on humid days. 10-20 minutes should do the trick to help some of the hot air and moisture escape.

Humidity can’t always be avoided, but it can at least be remedied. Invest in a small dehumidifier and ventilate your RV to improve air flow and lighten the load on your small air conditioning unit.

• High-Efficiency Work: Small and compact dehumidifier with 16 ounces/ 500 ml capacity tank extracts up to 9 ounces/ 250 ml daily in enclosed...
• Auto-Shutoff Function: Compact dehumidifier shut-off automatically when full water. Led would turn Red when the water tank needs draining....
• Ultra-Quiet& Efficient: Built-in Thermo-Electric Cooling Technology (Peltier) operates without a compressor meaning whisper-quiet operation...

Reason 5: The Thermostat Is Broken

If you find your air conditioner only works if you keep having to turn down the thermostat and you’ve ruled out the other possibilites, you may have a broken thermostat. Now, this is only applicable for A/C units with thermostat controls.

If your thermostat is an older unit then changing it is probably a good idea anyway since the old slider styles are notoriously inaccurate for temperature readings.

Follow the quick steps below to double-check your thermostat reading:

• Check the temperature with a thermometer reading.
• Compare it to the temperature reading on the thermostat. If they are approximately the same, it’s not the thermostat.
• If the reading is different, the RV’s thermostat is malfunctioning.

Replacing a thermostat isn’t overly difficult but you should be comfortable doing minor electrical work. If you aren’t, hire a professional to ensure the job is done properly and safely. Here are the details on using a household thermostat in your RV .

Reason 6: Low Refrigerant

Low refrigerant could be the cause of your freezing issue but most likely it’s not the problem. RV air conditioners are factory sealed (hermetic) which means its a closed-loop system so unless you have a leak somewhere you won’t be losing any refrigerant.

Also, since they are a closed system there is nowhere to add refrigerant if you suspect this is the issue. Some technicians will install a service port in order to add refrigerant but frequently, for the amount of work involved, its cheaper to get a new unit.

If you have a newer RV definitely look at your warranty and see if you are still covered. If your newer A/C is freezing and you’ve cleaned your coils hopefully your warranty will cover replacing the unit

Other Common Problems With RV Air Conditioner Units

It’s possible to have other trouble with RV air conditioners as well (aside from freezing). Let’s discuss the other issues you might face—as well as the remedies.

The Unit Blows Hot Air

If the air conditioner in your RV blows hot air instead of cool air you’ll want to confirm the compressor is turning on. If it’s not turning on then it’s likely a power issue.

If the fan is running but the air isn’t cooling make sure it’s not as simple as the cooling function is off. If your unit is on auto then you might just need to turn the thermostat down to get it colder.

If the compressor is coming on then you’ll want to check for proper airflow. Many of the above checks would apply like making sure your coils and filters are clean.

Another possibility is the air conditioner is low on refrigerant. As mentioned above this is basically a death sentence for an RV air conditioner. Having a technician add more refrigerant will likely cost more than just replacing it.

The Unit Is On But The Fan Isn’t Moving

There is a small fan inside the air conditioner system in your RV. It propels cold air through the system and into the rooms of your RV. If the fan isn’t running then hopfully it simply needs a little oil to start running again.

To access the fan you’ll need to get up on the roof again and remove the shroud. Make sure all power is disconnected from the air conditioner then spray it with a small amount of WD-40 or other similar products. Move the fan gently and spray a little more on the areas that were previously covered. If necessary, dab off any excess oil.

Turn the unit on again, and it should be fixed!

The Air Conditioner Won’t Turn On

Sometimes air conditioner units simply won’t work. There are two possible reasons for this.

The first possible reason the air conditioner (or anything else in the RV for that matter) won’t turn on is that you used too many electrical appliances at once. This can be an issue if you are using your generator or even if you are plugged into shore power.

Running several power hogs at once, like the air conditioner and microwave might not be a good idea. Avoid using multiple devices with large current draws at the same time.

Another real possibility the air conditioner won’t turn on is because the unit completely gave out. Every appliance gets to a point when the components inside start to fail. Here’s what to do if your air conditioner just hums.

Be sure to check what your warranty covers if you have a newer RV. If your RV is a new purchase, this and other repairs might be covered free of cost to you. If this is the case, don’t try to fix anything yourself because it might void the warranty entirely.

In the event that your older RV’s air conditioning doesn’t make cold air (and isn’t covered under warranty), you should turn to a professional RV mechanic and/or dealership to install a new unit for you. Though it might be an inconvenience for you and your wallet, professionals will be able to get your RV back to normal temperatures for you in no time.

These are some of the common problems you might face with your RV’s air conditioner. Solutions here can be simple, but they vary in cost. Whether you’re able to fix them yourself or need to bring in the professionals, you’ll be back to your regular travels shortly.

Diane is a lover of all things travel. She and her young family wanted to explore North America from the comfort of their own home so they bought an RV. After fully rehabbing a 1994 Safari Trek, they set out to explore both Canada and the USA.

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Why Does My Camper AC Freeze Up? (9 Causes And Its Fixes)

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You know the importance of a good air conditioner if you’re a camper. Nothing is worse than being stuck in the middle of summer with no way to escape the heat! But it can be an absolute nightmare if your camper AC starts freezing up. What are some of the causes of this problem, and how can you fix it?

Blocked air flow is one of the causes of your AC freezing up. Low refrigerant levels, running the AC on cold nights, or a bad compressor can cause it. Other causes include clogged air filters, damaged blower fans, dirty coils, or condensate lines.

In this blog post, I will discuss the most common causes of this problem and how to fix them.

Causes of Your AC Freezing Up

Read on as I discuss the causes of your AC freezing up in detail:

1. Blocked Air Flow

The air conditioner requires constant airflow so that it can function correctly. If the airflow is blocked, it will cause the AC to freeze up. A dirty air filter is the most common reason for this problem. If the air filter is clogged, it will restrict airflow and cause the AC to freeze.

2. Low Refrigerant Levels

Another common cause of your AC freezing up is low refrigerant levels. When the refrigerant level gets too low, it can cause the evaporator coils to freeze. This can be caused by a leak in the system or simply by not having enough refrigerant to begin in the system. Ice will build up in your AC unit when this happens, eventually freezing up.

3. Dirty Filters

Filters are responsible for keeping the air clean. They maintain healthy air quality. This is done by stopping indoor air pollution while letting in the fresh air.

These filters require routine cleaning to operate at their best; if this is neglected, dust and debris can build up. In ideal circumstances, the warmer air through the filter keeps the coils from being iced over. However, when it’s blocked, there isn’t enough ventilation, which causes an air conditioner to freeze.

4. Damaged Blower Fan

The blower fan is designed to circulate air through the AC unit. If this fan is damaged, it will not be able to do its job correctly. This can cause the AC to freeze up because the air will not be able to circulate correctly.

5. Dirty Coil

The coils should be kept clean so that they can absorb heat properly. If they are not, it will cause the AC to freeze up because the coils will not be able to absorb the heat correctly.

6. Clogged Condensate Line

The condensate line is responsible for draining the water that is produced by the AC unit. If this line is clogged, it will cause the water to back up and eventually freeze.

7. Running the AC on Cold Nights

When camping, you may be tempted to run your AC on cold nights to keep the inside of your camper warm . However, this can cause the AC to freeze up. The AC is designed to operate in hot weather, not cold weather .

When the temperature outside drops, the AC unit has to work harder to maintain the same temperature inside. This can cause the coils to freeze.

8. Incorrect Thermostat or Fan Settings

Keeping the thermostat or fan set to “Auto” can also cause the AC to freeze. When set to “Auto,” the AC unit will turn on and off as needed. However, this can cause the coils to freeze because they will not have a chance to defrost properly.

It is best to keep the thermostat or fan set to “On” so the AC unit stays on constantly. This will prevent the coils from freezing.

9. Bad Compressor

The compressor is responsible for pumping the refrigerant through the AC unit. If the compressor is not good, it can’t circulate the refrigerant properly. This can cause the refrigerant to leak or not circulate correctly, which will cause the AC to freeze up.

How to Fix Your Camper AC Freezing Up

Now that you know some of the most common causes of this problem, let’s discuss how to fix it.

Clean or Replace the Air Filter

As I mentioned, a dirty air filter is one of the most common reasons for your AC freezing up. If the air filter is clogged, it will restrict airflow and cause the AC to freeze.

You will need to clean or replace the air filter to fix this problem. I recommend replacing the air filter if it is over three months old.

You can refer to the owner’s manual for your AC unit if you need to learn how to replace the air filter.

Clean the Coils

You need to maintain clean coils to prevent your AC from freezing up. If the coils are dirty, they will not be able to absorb heat properly.

To clean the coils, turn off the AC unit and remove the access panel. Once you have access to the coils, you can use a brush or vacuum cleaner to remove any dirt or debris.

Replace the Blower Fan

If the blower fan is damaged, it will need to be replaced. Blower fans are available online or at most hardware stores.

To replace the blower fan, remove the access panel and disconnect the wires from the old fan. Once the old fan is removed, you can install the new one and reconnect the wires. Refer to the owner’s manual for your AC unit if you need help replacing the blower fan.

Clear the Condensate Line

The condensate line has to be clear for the AC unit to drain correctly. If the pipe is clogged, it will cause water to back up and eventually freeze.

Removing it is different for every unit, so you need to refer to your owner’s manual. You will likely need to remove the access panel and locate the line. Once you find it, you can clear it with a brush or compressed air.

If the line is completely blocked, you may need to replace it. Condensate lines are available online or at most hardware stores.

How to Prevent Your Camper AC from Freezing Up

Here are a few tips to help you prevent your AC from freezing up in the future:

• Change the air filter regularly
• Keep the coils clean
• Replace the blower fan if it is damaged
• Clear the condensate line regularly
• Do not run the AC unit in cold weather
• Keep the thermostat or fan set to “On”
• Do not use the AC unit if the outside temperature is below 60 degrees Fahrenheit

By following these tips, you can help prevent your AC from freezing up in the future.

Final Thoughts

Your camper AC is likely to freeze if the air filter is dirty, the coils are dirty, the blower fan is damaged, or the condensate line is clogged. You can fix this problem by cleaning or replacing the air filter, cleaning the coils, replacing the blower fan, or clearing the condensate line.

This article has helped you learn about why your AC is freezing and how to fix it. If you have any questions or comments, please feel free to leave them below.

We’re passionate about getting the most from your car when it comes to going on adventures and road trips. When you take one of these trips you often need more room in your car than you usually would. This is when we come in, to help you find the best roof tent for your car and needs.

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4 Causes of Your AC Freezing Up (And How To Fix It)

• Updated On 03/30/2024

Hot summers have us running the A/C on full blast.

One of the side effects many people get from this is a frozen indoor coil.

You’d think all the ice would help keep things cool when it’s hot outside, but it actually does quite the opposite. Usually you’ll have warm air or almost no air coming out of your vents.

Don’t worry, this is an extremely common problem I see all summer long and as a licensed HVAC contractor I’ve got some info that can help you out!

Why Is My AC Freezing Up?

What causes A/C’s to freeze up can be something simple like a dirty air filter or a clogged evaporator coil.

Sometimes the cause can be something mechanical like leaking refrigerant or some part has failed. Unexpected low outdoor temps or even setting the thermostat too low can sometimes the coil to ice up.

There’s usually a quick fix for frozen ACs, but it can be a little more involved and you may need some professional help.

Keep reading to learn what causes the AC to freeze up…

Cause #1: Blocked Airflow

This is definitely the most common reason I find frozen units.

Plugged filters or coils prevent air from moving through your evaporator coil. Airflow is essential when running your A/C, because it exchanges heat from your house to the refrigerant that can moved outside.

Without the warm air from the house moving through the coil, the refrigerant temperature plummets.

The moisture on the coil from the humidity in the air begins to freeze and eventually creates a big block of ice. 

How To Fix?

The solution is actually pretty simple. Turn the A/C off and allow the unit to thaw.

It’s usually best to switch your fan to the “on” position to allow it to continue running and help thaw the unit faster. I wrote another article on  how to thaw an A/C unit  if you want more info on how to speed up the process.

After a few hours it should be thawed and you can replace the air filter. Make sure your filter is changed regularly and have your system tuned up and cleaned to prevent things from getting plugged up.

Cause #2: Mechanical Problems or Refrigerant Leaks

Air conditioners have a lot of moving parts and if not maintained parts can fail.

Fan’s can stop working, valves can stick or plug up, pipes can kink or leak, and any one of these things will cause a low pressure issue. Pressure and temperature are directly proportional, meaning they follow each other.

When the pressure goes down, so does the temperature. So this lack of pressure indicates a low temperature and when low enough, moisture freezes and creates a frozen A/C.

This type of problem is typically fixed by a contractor or technician.

When dealing with refrigerants, there is a risk factor. Refrigerant is stored at high pressure and has extremely low boiling points at atmospheric pressure. That means it burns almost immediately if it touches your skin.

Here is our article on  how to refill air conditioner refrigerant  if you’re comfortable and confident in doing so, but I would recommend calling a professional to help diagnose and correct any refrigerant related issues.

Cause #3: Cool Summer Nights

Air conditioners have a range in which they can operate properly.

Low outdoor temperatures are another reason for your A/C pressures to drop and cause ice to form.

Most of the time if it’s below 60°F outside and your A/C is still running this can happen. 

Shut your system down and allow it to thaw. If you see the temps falling outside, it’s best to open the windows and allow your house to cool naturally to prevent your A/C freezing up.

Some applications prevent this though, and you may need to run your system at lower outdoor temps. If that’s the case,  look into installing a low ambient kit.  

This allows the outdoor fan to cycle and your compressor to build pressure and keep the A/C running when outdoor temps are cooler.

Cause #4: Thermostat Is Set Too Low

Some people like it cold inside and that’s okay! You just have to know your systems limits.

Try not to set your thermostat lower than 67°F.

Just like low outdoor temps, when indoor temp is too cold it drops the refrigerant pressure too low and ice begins to form.

Allow the unit to thaw and keep your thermostat at a reasonable temperature. 67°F and above is generally okay and should not freeze.

Read Also >> What Is A Good Temperature For AC in Summer?

How Does An Air Conditioner Work?

Knowing how an air conditioner works can help you understand why the AC keeps freezing.

There’s a lot of technical information involved, so we’re just going to cover the basics and make it easier to understand.

Your air conditioner has two main parts, an indoor evaporator and an outdoor condenser, connected by copper lines that carry the refrigerant. The evaporator is absorbs heat from the air and moves it to the condenser where it is compressed and rejected through the coil.

In order for the refrigerant to absorb heat energy from the air, the temperature has to be lower than the temperature in the house, but above the freezing point of water .

That’s why when something goes wrong, it can easily start to freeze the moisture that collects on the coil and prevent your vents from blowing cold air.

Frequently Asked Questions

How should i stop my a/c freezing.

Regular maintenance and filter changes are essential in preventing your A/C from freezing up. Make sure you have good airflow and allow your system to thaw completely if it does freeze before you turn it back on.

When in doubt call a professional and get things checked out.

Will My A/C System Unfreeze Itself?

It can fix itself if the temperature was set too low, or if it was running when the outdoor temps were too low.

Simply allowing it to thaw and turning it back on is all you need to do. If the cause was something else, then you may need to dig a little deeper and see what happened. Start with your air filter and follow the list above. 

What Is The Fastest Way To Thaw It?

Turn your thermostat to “off” to shut the A/C down and switch the fan to “on”.

Moving air through the coil helps the ice to thaw much quicker. If you really need it to thaw quickly, you can turn your furnace on and allow the heat from the furnace to help melt the ice.

Keep in mind this can cause a lot of water to leak out as it thaws and make a mess on your floor, so be prepared.

Read Also >> How To Check If Room Thermostat is Faulty?

Final Thoughts

Air conditioners freeze all the time so don’t fret.

Be patient when allowing it to thaw and make sure you’re doing preventative maintenance on your system. Airflow is essential in preventing your air conditioner from freezing up, so check your filter regularly.

If you’ve exhausted all solutions call a professional and get things looked at, but there’s a lot you can do to start with that may prevent you from having to call for help. A service call can end up just being a very expensive air filter!

• Lack of Airflow Leads To Freezing | ITI College
• Common A/C Problems | Energy.gov
• Signs of Frozen A/C Units | FloridaPace.gov

Meet Your Home Inspector Secrets Author

Dakota norris | licensed hvac contractor.

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Why Is My Heat Pump Freezing Up In the Summer: Causes and Fixes

The last thing you might expect on a hot, muggy day is to discover ice in your heat pump system. While it might not make sense initially, it’s actually a common problem with heat pumps and central air conditioning systems. 

A heat pump that’s freezing up in the summer can cause a host of issues including damage to your home and system. HVAC.com explains common causes of a frozen heat pump in the summer and discusses solutions to unthaw your system so it works properly again.

Identifying a Frozen Heat Pump

Although it’s quite common for a heat pump’s outdoor coil to freeze up in harsh winter conditions, especially if the defrost cycle malfunctions, it’s the inside  evaporator coil that is most likely to freeze up during the summer months.

Homeowners can identify a frozen heat pump in the summer by observing signs such as reduced airflow, a lack of cool air, the system continuously running without achieving the desired temperature, or water leaks around the indoor unit.

Common Reasons a Heat Pump Freezes Up In the Summer

Let’s delve into some of the reasons your heat pump may ice up:

Restricted Airflow

Restricted airflow often leads to a frozen heat pump evaporator coil, with  dirty air filters , blocked vents or registers, leaky air ducts, and faulty blower motors usually the culprits. Restricted airflow can cause the evaporator coil to become too cold, causing condensation to freeze on its surface. In severe cases, the entire evaporator coil can become a solid block of ice.

Low Refrigerant Levels

Low refrigerant levels can result from leaks in the system, which cause a decrease in pressure and temperature. When refrigerant levels are low, the evaporator coil can’t absorb enough heat from the surrounding air, leading to freezing.

Thermostat Issues

Even a malfunctioning thermostat can lead to longer cycles than necessary, causing the evaporator coil to overcool. If the thermostat isn’t working properly, it can lead to longer cycles and eventually a frozen coil.

How to Fix a Heat Pump that’s Freezing Up

When faced with a frozen heat pump, address the issue promptly to prevent further damage. Here are some solutions:

• Turn Off the System: The first step is to turn off your heat pump to prevent further icing and potential damage. Allow the system to completely thaw before attempting any repairs.
• Improve Airflow: Check and replace dirty air filters regularly to ensure proper airflow. Also, remove any objects such as carpeting or furniture from vents and registers. Sufficient airflow is crucial for preventing the evaporator coil from freezing.
• Check Refrigerant Levels: Contact a professional HVAC technician if you suspect a refrigerant leak, as refrigerants should not be handled by homeowners. They can inspect the system for leaks, repair any damage, and recharge the refrigerant if necessary.
• Calibrate the Thermostat: Verify that your thermostat is calibrated correctly and set to the appropriate temperature. If you notice any issues with your thermostat, such as inaccurate temperature readings or erratic behavior, consider replacing it.
• Thaw the Coil: Once the system is turned off, you can help speed up the thawing process by using a hairdryer on a low heat setting to gently warm the frozen coil. Avoid using any sharp objects or excessive force to remove ice, as this can damage the coil.

If you’re unsure about DIY repairs or encounter complex issues, don’t panic! Reach out to a  certified HVAC technician with the know-how and proper training to unthaw the heat pump evaporator coil.

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See the chilling photo that captures bullet as it flies past Trump

• Updated: Jul. 14, 2024, 5:54 a.m.
• | Published: Jul. 14, 2024, 5:51 a.m.

• Kevin Manahan | NJ Advance Media for NJ.com

Former president Donald Trump , who said he was hit in the ear by a would-be assassin’s bullet, came within inches of possible death at a campaign rally in Butler, Pa., on Saturday night.

A photo credited to White House Press Corps photographer Doug Mills appears to capture a bullet as it flies past Trump.

A remarkable photo captured by my former White House Press Corps colleague Doug Mills. Zoom in right above President Trump’s shoulder and you’ll see a bullet flying in the air to the right of President Trump’s head following an attempted assassination. pic.twitter.com/FqmLBCytoW — Haraz N. Ghanbari (@HarazGhanbari) July 14, 2024

Trump issued a statement on his Truth Social media site, after the apparent assassination attempt , saying, “I was shot with a bullet that pierced the upper part of my right ear. I knew immediately that something was wrong and I heard a whizzing sound of shots, and immediately felt the bullet ripping through the skin.”

The U.S. Secret Service is investigating how a gunman armed with an AR-style rifle was able to get close enough to shoot and injure former President Donald Trump at a rally Saturday in Pennsylvania, a monumental failure of one the agency’s core duties.

The gunman, who was killed by Secret Service personnel, fired multiple shots at the stage from an “elevated position outside of the rally venue,” the agency said.

The FBI early Sunday identified the shooter as Thomas Matthew Crooks, 20, of Bethel Park, Pa.

Here’s the complete Trump statement:

“I want to thank the United States Secret Service, and all of law enforcement for their rapid response on the shooting that just took place in Butler, Pennsylvania,” Trump said. “More importantly, I want to extend my condolences to the family of the person at the rally who was killed and also to the family of another person that was badly injured. It is incredible that such an act can take place in our country. Nothing is known at this time about the shooter, who is now dead. I was shot with a bullet that pierced the upper part of my right ear. I knew immediately that something was wrong and I heard a whizzing sound of shots, and immediately felt the bullet ripping through the skin. Much bleeding took place, so I realized then what was happening. God bless America.”

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