Question about Dometic Rooftop RV Air Conditioner

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Isn't cooling now that i've fixed leak

My roof top a/c was leaking inside my rv and i found that the drain holes were plugged up. i cleaned them up then my a/c started whistling real loud and now it blows warm air. when its set on low on thermostat it rattles and whines but high speed is almost normal except for warm air, the a/c did run cold until then.

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The repairman that unclogged the drain holes tore off the insulation and didn't put it back on,so the a/c ran hot from then on and the noise was amphilied(sp) without it. i went up and opened it up and put some of that silver sheet insulation on it ,put it back together and wa-la it ran cold and quiet. needless to say i won't have that repairman back.i guess common sense was the cure. thank you anyway.

Posted on Sep 07, 2008

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You won the battle, but lost the war, you need a full service, like cleanning both coils (front back coils , wash fan blades Front--back) clean filter( or change,) oil fan motor, check wirings,and connections for tightness, and last check charge. If the compressor don't start then add a hard-start-kit $10:00!

Posted on Sep 07, 2008


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Why is my roof rv a/c leaking condensate water inside Pop Up

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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.

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Yes there are drain holes in base of upper unit (on roof), which may be plugged. Couple of questions though to see if we can better troubleshoot this for you.
-Do you remember seeing water (condensation) running off roof before when AC was used?
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May 17, 2011 | Dometic Rooftop RV Air Conditioner

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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

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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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