Question about Dometic Rooftop RV Air Conditioner

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Bent grates on the roof unit how serious of a problem is it??

My roof unit has bent grates, the thing that looks like a radiater, Got bent by a pressure washer.. How serious of a problem is that?

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That is what removes the heat from the hot gas, if bent or pluged, it will make the system work a lot harder. Just take a knife and straighten them back, or go to a supplyhouse for ac and ask for a coil fin comb to straighten back out fins on a coil!

Posted on Sep 07, 2008

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Posted on Jan 02, 2017

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Dometic rooftop ac not getting cold

Could be any number of thing.
Things you can check yourself, get on the roof and see if the vents at the back of the roof unit are clogged with dirt or if the fins on the condensor ( behind the cover) are bent. If so clean the vents and use a comb to straiten the vents so air can flow. You can wash this out with a garden hose.
If that doesn't help and the unit is running the next stop is at a garage or camper store to see if the refrigerant level it low and if so why.
Please be aware the refrigerant should not leak out if it is leaking there is a reason and while recharging the a/c will help for a while it is only a temporary remedy.

Feb 25, 2012 | Heating & Cooling

1 Answer

Outdoor unit fan makes noise?

Could be a number of things from a foriegn object inthe way of the , a bent blade , bad bearing in the motor. Find a hvac guy you trust to take a look at it.

Nov 26, 2011 | Heating & Cooling

1 Answer

Water drips into the camper through the foam rubber air intake, after it runs for awhille

Sounds like your drains for drip pan under the evaporator area are plugged. They are located at the base of the AC unit on roof. Look real close under AC unit near front, for a hole in base plate of AC on each side. Water ( condensation ) should be dripping out of those holes pretty steady when running.
You should have an inch or so clearance between base of AC and roof to try and get a bent piece of wire, or similar in to hole and try to clean it out. If that doesn't help you will have to remove plastic cover and remove all the screws that hold the front cover over the evaporator and remove the front metal cover. Look down at base of the coils and fins and you will see a drip pan that has small holes at each end for drainage. They will get plugged up with debris, thus poor, if any drainage. I use a long air nozzle and a small compressor to blow them and the tray out to clean it well. That will usually cure your problem. Please remember to shut all power to AC, off at breaker panel before removing the cover on roof to avoid electrical shock.

Sep 04, 2011 | Dometic 57915531 Air Conditioner

1 Answer

I just had my rooftop compressor replaced under warranty on my Newmar Baystar. I asked that the cover from the original unit be used since it was painted to match the RV. It seems to be working fine, but...

New gaskets and foam blocks should always be used when replacing or reinstalling the ac unit. With that in mind, as long as you have no "new" noise or vibration when the unit is running, no loss in efficiency or any leaks, you should be fine. If you're near an authorized service center, have a tech go up and take a look just to make sure all is well.

Sep 19, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I bought a 1200 serious heat cool window unit.. I noticed when we removed it from te casing, that one of the copper tubes, a small two inch extention on the top was bent and crimped. This piece was a small...

Yes, that is the tube that was used to charge the unit...after the charging process the tube is often bent over, crimped and then soldered shut... that is perfectly normal and you should be okay...


Apr 17, 2010 | LG Heat cool Window Air Conditioner

1 Answer

Fan kicks on but

motor mount loose, fan grate loose, fan off balance, or the motor bearings could be wearing out. put your hand on the top of the motor grate. if by you putting your hand on it the buzzing stops, the hardware may need tightening. if it vibrates violently, the fan is off balance or the motor bearings are worn. if the blades are bent, you may be able to bend them back. if the bearings are shot, you need a new motor.

Aug 07, 2009 | Heating & Cooling

1 Answer

Rv roof ac

Your coil fins are likely bent or otherwise preventing all air flow. For more information on this, and how to fix it, here's a great, handy diagnostic article from a handy site,

Hope this helps. I found the site to be informative myself.

Jul 22, 2009 | Heating & Cooling

1 Answer

2000 roof-top Brisk-Air

I think you have a high pressure cutoff cycling the compressor on and off. Clean the filter inside the unit. Then with a hose clean out the foil condenser filter on top of the camper. Also you may need to buy a coil comb and comb out bent or damaged areas of the condenser coil on the unit that is above the roof of the camper.

Jun 09, 2008 | Dometic Rooftop RV Air Conditioner

2 Answers

I have a Coleman 5T 13 Seer Heat Pump. When the unit is running there is a lot of vibration (outside unit) and I hear a tinny sound (possibly like the fan hitting something). This seems to be worse...

First thing I would ask is did they locate the leak in the system before they recharged it? Your answer is YES to all three of your questions. If the unit is overcharged you can get what is called a liquid flood back to the compressor and this condition can cause compressor failure. Fans are balanced at the factory when manufactured. If a blade is bent or damaged it will throw it out of balance.

May 28, 2008 | Coleman Heating & Cooling

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