RV and Camper Rooftop Air Conditioner Maintenance, Troubleshooting, and Repair

Updated on November 21, 2017
Randy Godwin profile image

Randy is a lifelong lover of the outdoors and especially camping. This article is intended to help the RVer save money and time on repairs.

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Camper Trailer and Motorhome RV AC Servicing

Since the majority of motor homes, camper trailer, or RV A/C systems are used during the hottest time of the year, it is a must to keep them in good operating order. Merely cleaning and replacing the filter is not good enough to maintain your RV AC in tip-top condition.

There are certain procedures for guaranteeing the maximum efficiency of your motorhome or camper trailer A/C unit. These steps are not as difficult to perform as you might think and will save you money and inconvenience as well.

Cleaning the condenser and evaporator annually will make a huge difference in the cooling ability of the motorhome or camper trailer RV unit. Lubricating the A/C fan motor may help extend the life and performance of the unit itself.

You will also learn a little about how these RV cooling units differ from regular household units by following the tips in this article. Be sure and check the many actual questions and answers in the comments at the bottom of this page to find a problem similar to yours if the info in not found in the main text.

Gaining Access To The RV AC Unit

Removing the shroud from a Coleman rooftop AC.
Removing the shroud from a Coleman rooftop AC. | Source

Keeping Your AC Cool

Airstream Sovereign With Coleman Mach Rooftop AC
Airstream Sovereign With Coleman Mach Rooftop AC

Brands and Models of Rooftop RV AC Units

There are several main producers of rooftop units. Coleman RV air conditioners are common on many of the best equipped motorhomes and camper trailers. The same can be said for Carrier AC units, as well as Duo Therm A/Cs. Dometic made one of the first rooftop air conditioners, as well as, camper refrigerators and ice machines.

Thankfully, all of these units are similar in function and design. Some of these cooling units may even be identical under the shroud.. Being familiar with household AC units will aid you greatly in servicing and repairing your air condition system, but there are a few differences as you will see.

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Troubleshooting RV AC Units

Before beginning any repair or maintenance step, it is helpful to familiarize yourself with the main components of the rooftop AC unit itself. A fan motor circulates the air from the interior of the motorhome or camper trailer through the RV AC unit where it is cooled and then returned into the RV interior.

The compressor performs the job of circulating the Freon through the condenser and evaporator coils cooling fins and the cycle is repeated as the thermostat setting deems it necessary.

Both the compressor and the fan motor use capacitors to provide a high voltage charge to get them moving and a lesser charge to keep them running.

Often, only one capacitor is used for both fan and compressor. It the capacitor goes bad, neither the fan nor the compressor will start. This part is easily replaced and is not very expensive to purchase in most cases.

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Rooftop A/C Shroud

The AC shroud showing retaining screw holes
The AC shroud showing retaining screw holes

Rooftop RV AC Shroud Removal

In order to clean or repair the RV AC unit, it is necessary to remove the shroud from atop the unit. Ordinarily this is a simple job requiring only a Phillips screwdriver or small wrench. Remove the four screws or nuts from the AC shroud and carefully slide it up off of the unit.

If the shroud is old, it may be cracked around the retaining screws or the vent holes on the sides and back. Now is the time to repair the bad spots before replacing the shroud.

A good quality epoxy cement, or other glue made for plastic repairs, should be used to reinforce the weak or broken place before replacing the shroud. It is also advisable to use wider washers on the shroud retaining screws to prevent further cracking.

If the damage seems too bad to repair, a new RV shroud may be the only option. A broken RV A/C shroud will decrease cooling efficiency plus pose a danger of flying off while the camper is in transit .

Accessing the Fan Motor and Fans

The Coleman Mach  A/C Fan Motor made by Fasco
The Coleman Mach A/C Fan Motor made by Fasco
The rooftop unit With Condenser Cover removed
The rooftop unit With Condenser Cover removed

Servicing and Repairing the RV A/C Fan Motor

With the shroud removed, it is easy to inspect the fan motor for any repairs or maintenance needed. Before doing any repairs or maintenance to the rooftop RV AC be sure to turn the electrical breaker off or unplug the motorhome or camper trailer from the electrical power source. The starting capacitor may be still charged with high voltage, so be sure not to touch it with the bare hands.

The fan should spin easily when turned by hand. Even so, it is a good idea to oil the bearings and clean the accumulated debris from both front and rear fan blades. It may be necessary to loosen the fan motor from its mountings to fully access both ends of the motor bearings.

If the RV fan motor has oil tubes to lubricate the fan, then simply put a few drops of machine oil in the tubes on either end of the motor. If the motor has sleeves instead of ball bearings, you may still dribble a small amount of oil on the sleeves where they contact the fan motor shafts. Even a small amount of oil will do wonders for these types of fan motors.

If the AC fan motor still seems to start slowly or needs a nudge to start working, it is recommended that you replace it with a new one. If the fan motor has oil tubes evident on each end of the motor, it may be rebuilt and replaced for much less than buying a new one. It all depends on the particular unit on your camper.

If either the fan motor or compressor fails to start a new starting capacitor may solve the problem. Be sure to order the right size and voltage for your rooftop unit. These capacitors may be found at your local AC parts dealer or you may find them online for greater savings. Be careful when handling these capacitors as they may still hold some electrical charge.

This Condenser Needs Cleaning

Spray cleaner and a shop-vac will do the job.
Spray cleaner and a shop-vac will do the job.

Cleaning the RV AC Condenser and Evaporator

It is recommended that you clean the condenser and evaporator fins every couple of years to maintain the efficiency of your RV air conditioner. Eventually, the cooling fins on these units will become clogged with dirt and dust.

Use a good spray or foaming cleaner, such as those shown here, to loosen the debris and then use a wet/dry shop vac to remove the loosened dirt and dust. Be sure to cover the vent leading down into the interior to keep the grime from seeping down inside.

Be careful not to bend these fine fins as they will bend easily. A special fin comb tool made just for straightening these fins may be purchased from an RV AC parts dealer or through links on this page. Once again, be careful when performing this maintenance procedure.

Bent fins inhibit the flow of air through the unit, so be sure to keep them as straight as possible using the fin comb. You may need to use a fin straightening tool to align any bent fins in the evaporator or condenser coils.

Oh No! Not A Bad Compressor

A bad capacitor is often the problem if the compressor won't start.
A bad capacitor is often the problem if the compressor won't start.

RV AC Compressor Repair or Replacement

The most costly and difficult part of an RV AC unit to replace or repair is the compressor. In many cases it is advisable to simply replace the unit instead of trying to replace the compressor. With a new unit costing about $500 to $600, spending $300 to $400 dollars for compressor replacement doesn’t make much sense.

The labor involved, plus the prohibitive cost of the compressor, can almost pay for a new RV rooftop unit. These units are very easily replaced and will have a new warranty to cover future repairs for a few years. This is usually the correct option when the compressor goes bad.

The alternative is to find a used compressor. Unless you are skilled in replacing the compressor and are able to recharge the unit with freon, this is not advisable. This step is entirely up to your skills and pocketbook. There are used RV A/C parts available online and locally in some cases.

FAQS about RV AC Repairs

Be sure and check the many questions and answers in the comment section below. Feel free to ask a question if you don't see a similar question and answer, or simply ask the question if you don't have time to peruse all of the comments.

If you've encountered a strange problem and/or solution, please leave a comment below so others may learn from it. Thanks for any advice you may have to offer too! Thanks for relating any odd problem with your camper A/C and or the solution.

Now, Enjoy Your Camping Trip

If properly maintained and serviced, your motorhome or camper trailer A/C will last for many years of camping excursions. Most maintenance can be performed by the owners if they have basic mechanical skills. Understanding how an AC unit works may just save that camping trip you have been looking forward to for so long.

Be careful and take photos of the unit before removing any parts which may cause confusion during reassembly. Be sure to protect the roof of your RV while servicing your rooftop unit. Good luck with your repairs and maintenance.

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    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      12 days ago from Southern Georgia

      Gary, you may have a problem with excess air escape, but as long as it doesn't rain on the electronics you may be okay till you get home.

      Randy

    • profile image

      Gary Lovelace 

      12 days ago

      My cover blew off during my trip, do i need to replace it asap or can i wait a couple weeks when i am home?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      Lonnie, go to ACE Hardware or online to Amazon and purchase a couple cans of no-rinse foaming coil cleaner. Be sure to clean both coils well, and especially the one behind the filter.

      Randy

    • profile image

      Lonnie Ray Garrigus 

      2 weeks ago

      My roof air is dripping condensation on the floor ,what do i need to do to fix the problem ?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      Anthony, check the capacitors as they can go bad and produce such an odor. This may be all you need to do to fix the problem.

      Randy

    • profile image

      Anthony Williams 

      2 weeks ago

      Hey Randy... We have a heat pump? on top and the fan and low heat work great. When I engage the A/C we instantly get a burning smell. Id rather not replace the whole unit - any idea what I should look at? Thank you!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Bill, I live in southern Georgia, so that's a fer piece away. :)

      Randy

    • profile image

      Bill Martin 146 

      3 weeks ago

      Thank you Randy I will let you know how it works out. Do you happen to know of any RV air-conditioning repair shops in or around Prescott Arizona?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Bill, of course it can be recharged if you don't have a real bad leak somewhere. Some repairmen want to sell you a new unit if they can rather than recharging the old one.

      The Schrader vale being installed indicates someone has already charged the unit before.

      Randy

    • profile image

      Bill Martin146 

      3 weeks ago

      Hi Randy, I have an older coach w/ 36k miles(‘93 Fleetwood Jamboree) and the AC (Coleman) isn’t blowing cold air but the compressor works and the coil fan and the blower fan work. I have been told (over the phone) that it is a sealed unit and can’t be recharged however it has a Schrader valve at the end of the tubing. Is it possible that it can be recharged?

      Hoping you can help.

      Thank You.

      Bill

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Tina, the pump may have a filter which may be clogged. Other than that, an obstruction in the main water line could be the problem.

      Randy

    • profile image

      TinaNelson1130 

      3 weeks ago

      Ok I'm trying to turn my water intake from outside hose to my water tank that I have filled .And turned I turned on pump on inside panel I can hear the pump cut on but no water is coming out ??

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Harold, you should get only 12 volts at the thermostat. Check the voltage first.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Brandi, if the coils are clean then you may have a low Freon charge.

      Randy

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      Harold Durmon 

      3 weeks ago

      My rooftop unit is not coming on. It has a fuse in the tstat that kerps blowing. If i turn off the general purpose outlet breaker it does not blw the fuse. It worked fine when I parked it last year

    • profile image

      Brandi Ellison 

      3 weeks ago

      Our Coleman Mach keeps freezing up! I run the fan and it unfreezes, but wishin about 4 hours on high cool and on, it freezes up again.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Angie, you'll have to see what's listed on the compressor or on a plate nearby.

      Randy

    • profile image

      Angie 

      3 weeks ago

      Have a 2008 heartland cyclone 4012 toy hauler one of the a/c units needs Freon which type of Freon does it take?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Raymond, you need to cleans both coils because when they get clogged with dust and debris the fan cannot cool the compressor properly nor disperse the excess moisture into the air. This causes the compressor to overheat and trip the breaker and also causes moisture to build up and leak down into the camper.

      Go online to Amazon or to a local ACE Hardware and get some no-rinse coil cleaner. Be sure to clean both condenser and evaporator coils thoroughly.

      Randy

    • profile image

      raymond mcmahan 

      3 weeks ago

      I have a 1997 jayco 5th wheel and it sits under a metal carport.when it's hot outside 90ish running the AC unit it will sometimes trip the AC breaker.reset it will work for awhile and do it again.but when it's cool at nite and have ac unit on no problems.also the AC unit continually leaks out water onto the roof.any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Joe, it may be just the humidity being so high but the unit should still disperse the moisture. Yes, a humidifier may help with the situation and I'd like to know if it does.

      Randy

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      Joe Gronzo 

      3 weeks ago

      Randy, we have cleaned the unit completely and also tightened the screws on unit. Noticed that the unit does not drip at night but only when the sun is out and the temp. is in the 90's and index is over 100.

      Believe it is because it is just to hot. Do you think running a humidifer in unit would help?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Joe, apparently your coils are extra dirty, otherwise the fan should expel the excess moisture into the air. Try cleaning them with a wet dry shop vac after they've soaked awhile. Use a good coil cleaner.

      Have you tried tightening the gasket between the unit and the roof? Simply remove the ceiling assembly to tighten the gasket down.

      Randy

      Randy

    • profile image

      Joe Gronzo 

      4 weeks ago

      I have a 2016 Sportmans travel trailer. My air conditioner unit started dripping water inside unit. I have taken off inside cover and cleaned unit and filters. Went on roof and removed shroud and cleaned unit coils, pan and down spout holes.

      Stopped leaking for a day but now leaking again.

      It is not raining. We are in the south where the temp. is 95 with a heat index of 105 , could this be the problem?? Help, and thank you.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Kevin, some units have the fan running constantly while the compressor cycles on and off. Others, like your home AC, completely shut down when the desired temp is reached. Hopefully, yours is one of the former.

      Randy

    • profile image

      KevinMac1 

      4 weeks ago

      We have a 2017 Forest River FR3. The AC unit runs all the time, even when it has gotten down to the temperature set by the thermostat. The Fan just doesn’t shut off. I hear the rooftop unit shut off but no matter how high I then turn the thermostat, the fan continues to blow. My house unit completely shuts off when it gets to temperature so I’m assuming that something’s wrong in this situation. Any thoughts? Thanks!

    • profile image

      Jason4233 

      4 weeks ago

      Thank you I'll check that out

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Jason, this may be a capacitor going bad or leaking oil. I'd take a look at the capacitors and/or have them checked.

      Randy

    • profile image

      Jason4233 

      4 weeks ago

      Hello we have a 2018 trailmaster the main ac works great but has started to smell like rotten eggs. Not constant but can't figure out want would cause this. Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Walt, so glad my advise helped you out. Good luck with your future RVing! :)

      Randy

    • profile image

      Walt S. 

      4 weeks ago

      Randy, thank you so much your diagnosis it was right on . There was a mud wasp nest the size of my fist on the squirrel cage. When I left you the post we had just started a month long roadtrip and were in the desert heat. A national known rv store said it was the motor bearing and because of its age it the entire unit had to be replaced with us leaving the coach there overnight. Thanks to you and your expert diagnosis we are back on the road with an a/c that works! Thank you again!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Seana, this may be a bad capacitor. Around 25 bucks and usually easy to replace.

      Randy

    • profile image

      Seana 

      4 weeks ago

      Hello,

      We have a 2016 Cruiser Fun Finder with dometic AC. Recently when it's close to the desired temp, the fan is very slow & low sounding..if you turn the temp down, the fan will slowly get back to how it usually operates. It doesn't always do this, very intermittently. Any insight is appreciated!

      Seana

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Walt, check the squirrel cage fan for mud daubers as they commonly place their nests there.

      Randy

    • profile image

      Walt S 

      5 weeks ago

      Have a duo therm ducted a/c on our holiday rambler atlantis. A/c blows cold but viberates very badly. I checked the fan blades and they are ok. Any suggestions?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Cam, first have the compressor capacitor checked and/or replaced. A weak cap can cause this problem.

      Randy

    • profile image

      Cam 

      5 weeks ago

      I have a 2011 Creekside 23 RKS when we turn on the AC the fan comes on but when you turn on the Ac cold air comes out but within 30 seconds the breaker breaks. Any ideas

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Kodiak-- Try cutting off the AC breaker in the main power panel and see if this helps.

      Randy

    • profile image

      kodiak 24 

      5 weeks ago

      I have a dutchman travel trailer and when I hook up to my honda 200 generator the a/c unit comes on even though I have my thermostat set to furnace mode. How can I get the a/c not to come on when the gen set is running?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Austin, if your camper has a ducted system--either in the floor or ceiling--it's possible one or more of the ducts have collapsed and blocking the airflow.

      Randy

    • profile image

      Austinmattocks 

      5 weeks ago

      Hi, me and my wife had just bought a jayco swift flight year 2013 and the a/c had been working awesomely for the first week , we went back home for the weekend then returned to our rv on Sunday night and the air flow was drastically decreased but the air coming out is still very cold....i am just very confused as to why the airflow would be so diminished so quickly out of nowhere

    • profile image

      TinaNelson1130 

      5 weeks ago

      Thanks so much!! Tina

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Tina, some units--especially ducted AC's--will only have the fan running before the set temp is reached. On others, the fan will run continuously even if the compressor cuts off.

      Randy

    • profile image

      TinaNelson1130 

      5 weeks ago

      I just bought a 2013 Puma , and when you turn the Ac on the fan stays running the compressor cuts off , but the fan never cuts off?? Is this normal?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Jim, with a digital multimeter set on ohms, if the cap is good it should show a random number decreasing in value when you contact the terminals with the probes.

      A steady or nonexistent number typically indicates a bad cap. Hope this info helps.

      Randy

    • profile image

      Jim282 

      6 weeks ago

      Randy

      I see where most of the problems encountered here are possible bad caps and your solution on a lot of them are to test the cap. What is the procedure to test a cap? Is the procedure the same for both start/run caps and compressor/fan caps?

      Thanks for all of your help.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Carrie, probably a bad compressor capacitor. Around $25 and easy to replace.

      Randy

    • profile image

      Carrie 

      6 weeks ago

      I have 2012 Springdale travel trailer during our camping trip the fan turned on but the compressor would not. This is a domanec ac

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Shane--This may be a control board issue since the new stat didn't make a difference.

      Randy

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      Shane262 

      6 weeks ago

      I have a 2015 Dometic 15,000 Brisk Air II. I has worked perfectly in the year I've owned, up until last week. While it still cools fine, it will reach the set temperature and then turn off. 9 times out of 10 it will not turn back on unless you turn off the thermostat, wait a minute and then turn it back on. It is on a single zone LCD thermostat. No fault codes show. I bought a brand new thermostat and replaced it. Same issue. Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Mark, yes this could be a bad capacitor.

      Randy

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      Mark 

      6 weeks ago

      AC unit was running absolutely fine. Turned it off because humidity went down and it was a nice night. When I tried to turn the AC back on, nothing. Compressor and both fans will not run. I can hear the relay click when I move the slider on the thermostat. Could this be a capacitor issue?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Tracie, I do not have a wiring schematic for your camper, but you should be able to get one from Jayco online.

      Randy

    • profile image

      Tracie 

      7 weeks ago

      Heat or air will not come on at all. Before the heat would come on and try to run for less then a min and shut off. Then when we had a “repair” guy look at it, nothing worked! Where do I go to find what wire goes where? Maybe the whole service book for a Jayco 28ft 5th wheel that will tell me EXACTLY where everything from air to heat, then thermostat. He changed it all around to see if he could get the heat to blow and now nothing works AT ALL!!!

      Please help!!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Cody, there should be some on this page or in the blue text of the article.

      Randy

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      Cody 

      7 weeks ago

      Where do I go to find your amazon ads?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Bruce, this is a common problem caused by dirty coils. When the coils get clogged by dirt and dust--even thought he filter is cleaned often--the excess moisture cannot be expelled into the air by the fan.

      Either go to a local Ace Hardware store or to Amazon and get some spray no-rinse coil cleaner and this should solve the problem.

      Randy

    • profile image

      Bruceharris218 

      7 weeks ago

      Hello, we are having an issue with our A/C dripping water inside our RV, when we close the vents to push the air throughout the trailer in starts dripping and it is not cooling the trailer down.

      Can you give us some suggestions on what could be causing this problem

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Molly, the first things to check are the capacitors. Easy and cheap to replace.

      Randy

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      Molly Hopper 

      7 weeks ago

      Hi randy,

      My dad has a 1994 wilderness travel camper, today my ac quit working the fan will come on and when I switch to ac it’ll run but won’t give me cold air. Can you give me any help on how to fix it. Thanks,

      Molly

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Lou, you'd be better to simply replace the entire unit than looking for a replacement compressor. Any unit will fit the opening in the roof.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      RV Russ, this may be either a thermostat or control board issue.

      Randy

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      RV Russ 

      7 weeks ago

      Hi Randy. Have an older Coleman Mach unit (94 Gulfstream). Starter cap went out last year. Replaced this year. Fan motor will run for 5-10 minutes then stop. The compressor keeps running. After 10-15 minutes the fan motor will work again for a few minutes. Blows good cold air while fan motor works. Any ideas? Thanks.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Tabitha, have the capacitors for the compressor and fan motor checked first. Usually a burnt smell indicates a bad capacitor.

      Randy

    • profile image

      Tabitha 

      7 weeks ago

      We were able to replace the outer fan (not exact model but still fit our unit) for our roof top unit. We noticed after about 4 hours of running the unit that there was a burnt smell and the air was not cold air blowing into the trailer. What do we need to replace or fix next to get this back in service?

    • profile image

      Tabitha 

      8 weeks ago

      Thanks! It was the fan that is responsible for cooling the coils. We will try to replace it in the morning. Thank you so much!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      Tabitha, which fan broke? There are two fans in the unit, one which circulates the air--a squirrel cage fan--and another which cools the rear coil--a bladed fan. I assume it's the latter , otherwise the air inside would not be blowing at all.

      You may just have to replace the fan to solve the problem with the cooling. Check Amazon for a replacement fan.

      Randy

    • profile image

      Tabitha 

      8 weeks ago

      Hi Randy! We have a 2014 Kodiak travel trailer that is having AC issues. We had just gotten set up at a campground this evening when we heard a loud bang noise. Upon entering the trailer, we noticed that the air coming out of our vents was warm air being blown but the HVAC was not “kicking on”. We turned the unit off for awhile thinking maybe it just needed time to cool down as we are in 100degree weather but upon turning it back on an hour later, the fan would kick on for a short period of time and then go off again. We were just able to get up on the roof to inspect the unit and found that our fan is destroyed and has broken into pieces. Could this possibly be a result of a blown capacitor or what could have caused this and what is a good approach to repair? Thanks!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      MP, this is a sign of dirty coils. Get some no-rinse coil cleaner from Amazon or at your local ACE Hardware store and clean both coils well. Dirty coils don't allow the fan to disperse the excess moisture into the air as it normally does.

      Randy

    • profile image

      M P Hilemon 

      8 weeks ago

      Please can you tell me where “weep holes” are on the Coleman RV AC. AC is cooling well and fan is fine but leaking through unit into interior. NEver has before!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      Christine, sounds more and more like a bad capacitor. Around $25 and easy to replace if it is the cap.

      Randy

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      Christine Diaz 

      8 weeks ago

      I can hear it running, but it is making a ggrrrrrrrrr sound.. and doesn't blow out any air...

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      Christine, is the compressor coming on at all? If not, check and/or replace the capacitors first to see if one or more are bad.

      Randy

    • profile image

      Christine Diaz 

      8 weeks ago

      Need Help! We have a premier bullet RV that is only 9 months old. Unit that is connected to the thermostat doesn't blow anymore and is making a grrrrrr sound... any ideas on how to fix?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      Robert, can you tell if the compressor is running or not? If not, check the capacitors first as a bad cap can cause this problem.

      Randy

    • profile image

      Robert Burington 

      8 weeks ago

      Hello Randy,

      I have 2 older Coleman AC units on my RV. Yesterday my units were working fine, both were blowing nice cold air. Today the rear unit is blowing hot air?. the front unit still runs fine.

      So the fan runs fine on the rear unit, but no cold air and it actually feels like the air gets warmer as the unit is running.

      So I wanted to ask what to look for before I go up and take the thing apart.

      thank you

      Robert

    • profile image

      Lmartz 

      8 weeks ago

      Hey Randy, Yeah I checked all the Caps and they tested good. I could always try one just to make sure, but it sounded like the compressor was having some issues. I think that is what burned out the control board. I replaced the control board and the Fan started working again. I will check out your ads. Thanks.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      Lmartz, have you checked the compressor capacitor yet? If it's bad, the compressor won't start but will try. It's worth a try if the caps shows to be bad. About $25 and easy to replace.

      As far as replacement is concerned, I sell new units from my Amazon ads and they seem to be satisfactory to my readers.

      Randy

    • profile image

      Lmartz 

      8 weeks ago

      OK, I was able to trace and find a wire that was bad. Now getting power to unit on roof. Fan works, but the compressor is bad I think. Makes a noise like it is trying to start, sort of a whine, but does not engage. I believe it is seized up. That being said I think I see a new unit in my future. Any recommendations for replacing an old Mach 3?

    • profile image

      NAMTRA 

      8 weeks ago

      I don't think we would have had the burning smell from the low speed fan initially if it was a thermo issue. I will try the board. Thanks again for your help... it is appreciated.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      NAMTRA, this sounds more like a control board issue if you're sure the thermostat is working properly.

      Randy

    • profile image

      NAMTRA 

      2 months ago

      Update... Auto AC seems to work. But then once it reaches the desired temp the fan shuts off (as expected), but you can still hear the condenser cycling. Hi and Low fan still do not work.

    • profile image

      NAMTRA 

      2 months ago

      Hi Randy, thanks for your help last week. I finally got my new capacitor, replaced it... and still nothing. Low speed fan doesn't work. High speed and auto worked for about 20 minutes... now they no longer work. My trailer is only a little over a year old. I only saw one capacitor, with a brown fan wire, red C wire... I have highlighted it here in green: https://bit.ly/2Mteycv

      Your help is very appreciated... it's hot a smokey here in Washington!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Lmartz, sounds as if you've covered all the bases thus far. Yes, I'd check the voltage to both fan motor and compressor again.

      Randy

    • profile image

      Lmartz 

      2 months ago

      Hey Randy,

      I looked through about 400 posts but did not see my particular issue. I have a Coleman Mach 3 that was working and just died. I have checked all three caps with meter (uF) and they are all in tolerance. I verified T-stat is good by switching with my other unit and the rear T-stat started up the other unit fine. I ordered and installed a new control board. I am getting 12V to hear the relay click on control board, but nothing starts. Thinking I will go back up on roof and verify voltage at motor. Motor spins freely. Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      rd2930, sounds like a weak compressor capacitor. About $25 and easy to replace.

      Randy

    • profile image

      rd2930 

      2 months ago

      I just looked at a trailer I am thinking about purchasing. I tried the ducted AC and after 5 minutes of running it suddenly stopped. The fan will run when just on the fan mode but when you flip to AC you can hear a hum, like it wants to start, but nothing happens. After waiting about 5 minutes then trying again, it started to come on then stopped again. What could this be?

    • profile image

      Robert Bryan 

      2 months ago

      We tested the AC on a trailer we are thinking about purchasing. The ducted AC worked for approx 5 minutes then stopped. The fan is working when AC is off but you can hear a faint hum when switching on the AC but that’s all. What could be happening. This unit has not been running for several years.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Terry, the coils are probably clogged with debris and is causing the moisture to drip inside instead being dispersed into the air by the fan. Use some no-rinse coil cleaner to stop this from occurring.

      Randy

    • profile image

      Terry 

      2 months ago

      When the AC is running, condensation is dripping inside my RV. I removed the cover but didn't see any drain holes , cleaned around corners of tray but still drips inside, can you suggest anything else, thank you .

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      James, yes this may be a capacitor leaking oil, even if it's still starting the fan and/or compressor. It may not last long though.

      Randy

    • profile image

      James 

      2 months ago

      Hi Randy, I have an 18 year old Dometic Duo Therm (600 series). Yesterday I smelled a burned/electric? smell coming through the ducts, the AC is starting/working. Running the fan only it's fine, no smell. Any thoughts? Bad capacitor?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Mary, you may have a bad capacitor which can cause this problem.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Paula, whoever replaced the rubber roof installed your AC backwards which causes it to operate backwards.

      Randy

    • profile image

      Mary goodwin 

      2 months ago

      We cleaned the filter on the inside and when i went to turn on a/c it just clicks and lights dim. What did i fo wrong?

    • profile image

      Paula 

      2 months ago

      Had my rubber roof replaced. Now my air is not blowing threw my vents in the ceciling it is coming fron the unit

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Loren, the first thing to check is the capacitors as a weak cap can cause this problem. Usually cheap and easy to replace.

      Randy

    • profile image

      Loren 

      2 months ago

      Hello, we just recently bought a pop up camper and it has a coleman unit on it although I am not sure of the year. What is the cause of my a/c working fine for a few days running constant, and then waking up warm, finding that the low and hi settings are giving off about the same small amout of cold air? What can be done about it?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Junkman, you'll have to find this out by searching for the model online. I don't have this info.

      Randy

    • profile image

      Junkman60 

      2 months ago

      I have a 1992 model Coleman AC only I found where the compressor line low side clamps under a rubber grommet has worn through and sprung a leak.

      I'm going to add a service port and use a compression fitting to repair the leak how much r22 freon does this thing take so I can order the proper amount to do the job

    working

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