Question about Dometic Rooftop RV Air Conditioner

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Carrier RV AC is not blowing cold air, compressor sounds like it is on as well. Air is blowing but is not cold. Coils are clean. What else can be the cause? Please help.

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If the compressor is running and the air is cool but not cold it's probably low on refrigerant.

Posted on May 20, 2009


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I have a Itasca Horizon 2006 with a lower AC unit in it The problem is it never gets inside temp less than 10 degrees from outside. What is the Problem?

First check the temperature differential. How cold is the air coming out of the vents? How large is the volume of space to be cooled? what color is the outside of the RV? Is this a problem when you are parked or driving? You should get 20 degrees of cooling. If the unit cools and blows a lot of air then it may be that you re trying to cool too large a space and the answer maybe to close off parts of the RV when necessary. If you re driving you can certainly use the engine a/c as well. For this unit you must check the air filter and coils. Clean coils are essential. In an a/c unit cooled compressed refrigerant goes through an expansion valve and becomes cold as it expands. This cold gas makes the coils cold and takes the heat out of the air that passes through. You want the most efficient air flow and heat transfer you can muster. This a/c should do the job. So in your a/c unit there are two (2) compressors. You will not likely be able to run them both off of an inverter (if that is how you are trying to do it, without modifying the inverter for the higher loads.) You may only have one compressor working. Does the a/c do the job when plugged into shore power? If yes that solves the question. if no then figuring out if the second compressor is running is a must along with what it takes to make it kick on. With a little familiarity to how the whole system works you should be able to ferret out the way he system functions and then see what is not working properly. (PS: if you do not find an air filter then the coils will need to be thoroughly cleaned and a filter purchased. Keeping it clean is essential.)

Jan 01, 2015 | RVs


Efficiency of RV Rooftop Units Deteriorating???

If the overall effectiveness of you RV Rooftop AC seems to be much less than the day you bought, here is a simple procedure to keep it running cold and prolong the life of the unit.

1. Air seems to not be blowing as cold as before
2. Compressor trips breaker during the hottest part of the day
3. Air at night works just fine but is lacking during the day

These problems can often be solved by simply cleaning out the condenser coil of the upper unit. You will need a phillips screwdriver and a water hose with a nozzle on it.

- Remove the upper shroud from the unit
- Gently spray water through the condenser coil watching from the fan side. BE CAREFUL, do not spray with too high of pressure nor sideways. Make sure you keep the nozzle spraying directly at the coils.
- Once the water begins to flow clearly through the condenser, you should be good to go. Make sure you get as much of the condenser clean as possible.

This will save the life of many RV Air Conditioners.

on Jul 05, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

The compressor is kicking on when the AC is turned on, but it is not blowing cold air. $ is an issue, I'm hoping not to spend a fortune. Where should I start with trouble shooting?

these are sealed units, if the coils are not dirty and the compressor is coming on, it has probably got a leak some where in the system.... and lost all freon.....

May 09, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Ac unit is blowing cold air but not enough to cool down camper ]

Has it had a good cleaning recently? Coils/fins at condenser and evaporator?

Jun 27, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

Carrier air conditioner isn't cooling the house. It is blowing air, but it doesn't seem to be cool air.

Check the outdoor unit to see if it is discharging hot air out of the top ofd the unit, check the insulated suction line to make sure it is cold or sweating. Try to listen to the outdoor fan and the compressor to make sure they are both operating

Jun 24, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

The AC unit stops blowing

It sounds like the compressor is kicking in and out. There are several things that can cause this to happen. The most common and easiest cause for the homeowner to correct is a dirty coil. There are two coils.....evaporator and condensor. The evaporator coil is the coil that is protected by the air filter that you clean at least once a month. The condensor coil is the coil exposed to the outside. If either (or both) are dirty, it will eventually cause the compressor to kick out on internal overload. Inspect your coils and clean them thoroughly. If after cleaning the coils, you continue to have a problem, let us know and we will dig deeper to help you.
I hope you find this information to be very helpful to you as a solid jumping off point moving forward. :-)

May 19, 2010 | Heating & Cooling

1 Answer

Ac starts kicks on and off every couple mins

Sounds like the compressor is the one making the "NOISE". If the sound sounds like something trying to start, then kicking off, its probably the compressor and not the fan. Hence no cool air.

Jul 26, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Ac not blowing cold after outside temp reaches 98 degrees

Sounds like you have dirty condenser coils. Remove the upper shroud and check the condenser for clean. Take a water hose and gently spray out the coils paying special attention not to bend the coils over with too much pressure. This will allow more air movement through the coils and give you better cooling efficiency.

Hope this helps,


Jun 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Carrier air-v AC is not blowing cold air

There could be a freon leak, or just low freon levels. If this is the case, you have to call a certified a/c technician to recharge your system.

May 18, 2009 | Dometic Rooftop RV Air Conditioner

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