Question about Dometic Rooftop RV Air Conditioner

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Water is leaking from the ac vent in the inside of our rv. We took the cover off and it looks like water is leaking from some kind of hole in a silver box. How do you fix this?

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Water is NORMAL in the process of A/C, works like glass of icewater, water vapor condenses when chilled...This condenced water should be drained outside, usually by a black drain hose. you cannot block the water or the system will fail, smell bad, and damage the evaporator (similar in function to a heater core, but for AC).

Posted on Oct 15, 2010

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1 Answer

Why rv ac condensate leaks into rv


Drain holes on underside of unit on roof are probably plugged. Need to get up and look under and use a stick or similar to unplug drain holes. Should have condensation running across roof , if not, the drain holes are plugged. If worse comes to worse, may have to remove cover, only takes a minute, just be sure to shut power off prior.

Jul 14, 2014 | Dometic Rooftop RV Air Conditioner

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Our Duo-Therm RV rooftop AC runs great, but it leaks inside of the motorhome and it's quite annoying. I've read that it could be a problem with the pan. Where is that at and what does it look...


The pan is located under the front coil which is commonly called the evaporator. It collects the water which drips off the evaporator, and usually there is a drain hole located on the roof where the water will drain out in to a hose or some other kind of line. To locate the condensate pan, you will have to take the cover off of the unit, find the front coil, (looks like a radiator) and the pan will be under the coil. Look for the drain on the roof. The drain is connected directly to the pan. The pan could possibly be just stopped up with dirt, etc and may just need to be cleaned out. Other wise it could be rusted out.

Jul 28, 2011 | Heating & Cooling

1 Answer

RV AC is working fine, but the water is leaking from the ceiling Where is the drain tube on the unit, The AC unit is a roof type, Duo Therm serial # 43404934, Part # 3105459


Normally, the condensate will drain out of the unit onto the roof and off the edge to the ground. Remove your cover inside (probably 2 screws) and tighten the 4 bolts you will find inside. If they are tight, go to your RV supply place and get new roof gasket. Remove the AC and insert the new gasket and resecure the AC to your roof.

Thanks for your question @ FixYa.com

Jul 26, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a travel trailer with a coleman 7300 roof top ac unit. the unit will blow cold air but water leaks thru the plenum. i was told by the previous owner that it needs a new seal. i would like to fix it...


If it's leaking inside where filter cover is, then real good chance the drains being plugged is the only problem. If water (condensation) not running off roof when operating in cool mode, then I'd bet drains, which are located under unit on roof, and you should see them sticking down like buttons. They have a hole in side that needs cleaning with a pipe cleaner or similar to open them up. If need be, shut off power to unit and remove top cover on roof unit and look for the drain holes in base, and clean them out. If water comes in while raining, but AC not running, then it's gasket. That is remedied by removing ceiling assembly (just screws) and 4 bolts that pull/hold the upper and lower assemblies together, unplug wiring to upper unit, and simply lift it off, change gasket and re-install. Tighten those 4 bolts equally when gasket is aligned properly over hole, only until gasket is approx 1/2, original thickness. Plug harness back in and your done. (about an hours work.) Only other thing that may be wrong is styrofoam drip tray for cooling unit, under cover on roof may have a crack , allowing condensation to leak in. If that 's the case, you can try to find a sealant compatible with styrofoam to seal those cracks.

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1 Answer

Rooftop RV Air Conditioner: my duotherm rv ac rooftop 15,000 btu the free...


If it's the pencil type, it just pokes into the fins (carefully)
If you look real close with flashlight you should be able to see where it poked in before, usually a couple of inches up from bottom. If it's the little round disc, it snaps in down in bottom corner, there should be a small hole for it in the frame.

May 17, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a 1990 rv and the air condition is leaking


The drains for that will be between the upper unit and the roof of the RV. You only have an inch or 2 to see under there so it's pretty hard sometimes, but you should see little round button like things sticking down from underside of the roof AC unit. They have holes in them, and can usually be unplugged with a stick, or piece of wire. If you can't get them cleaned out, you will have to make sure you shut breaker(power) off to unit, and remove the cover by taking out the 4 big Philips head screws. That will give you access to clean out holes in base of tray for drainage. If your getting dripping inside when unit not running but raining outside, then gasket will need to be changed.

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Leaks inside when running


you might have a drain line plugged up...or a dirty evap coil...call if you need direction an what to look for...

May 12, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Duo-therm brisk air AC unit leaks water into my RV when it rains


take the cover off and make sure the drain line is clear on top off RV.

Nov 15, 2009 | Ovens

1 Answer

My a/c is leaking from the ceiling of the rv. i cant tell exactly where, but something isnt draining properly. does anyone have a clue as to what i can do about this? my rv is a 1989 model. the a/c is cold...


Look between roof & base of AC unit for little round button like pieces sticking down, which are drains, that have holes in sides that get plugged up. poking with a piece of wire or similar in that hole may unplug it. You should see at least 2. Depending on what type of AC unit, it may just be holes in base for drainage, but if necessary to unplug, you can easily remove cover. Coleman has 4 big Philips screws on top to remove & dometic has a bunch of Philips screws around lower edge to remove & cover will come off, to check where plugged. Make sure power is off inside.(breaker) You should see a trail of water across roof from AC when running & cooling, if not plugged. There is the posibility of a cracked drainage tray allowing water to leak inside as well on some of the older models. You should be able to inspect all of that when cover is off on roof. P.S. CAREFUL! Observe before lifting cover off for wasps in the area, as not unusual for them to make nests under cover. Be prepared, or do on cloudy day, early in the morning, or near sundown when less active. Also, if dew on roof, could be slippery.

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1 Answer

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Under the drain pan on each side should be a small plastic drain plug they might be clogged up with debris.

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