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Roof leak from seal between AC unit and coach roof

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Not very often that occurs but possible. If it has been running well for quite a while and not leaking, just double check that all 4 bolts are snug, but don't tighten too much and compress the gasket too much. I suspect that drip tray may be cracked, or drain holes plugged, and that is what is dripping inside. If it doesn't leak when unit is shut off, and it's raining, then I would pull the cover off, and check for blockage in all the drain holes. In order to properly clean 2 drains at evaporator coils (rear of AC), you will likely have to remove screws holding cover over it, and carefully lift it up and out of the way. Hard to see, but there is usually 2 drain holes in there, one on each side, and the tubes get plugged as well. Make sure power/hydro is off to unit for safety. If it does leak when raining, and unit off, then I'd say gasket needs replacing.

Posted on Apr 28, 2010

Testimonial: "Thanks for the answer. The 14x14 gasket is cheap and the damage from a leaky roof could be large. New gasket on the way. Honey Motor Home owner "

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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...


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Those mounting bolts are what pulls the AC unit snug against the gasket. The instructions say not to overtighten them when you first install them because you need to leave space to tighten them later as the gasket ages and loses its "spring". The gasket also, over time, compresses under the weight of the AC sitting on the roof "bouncing" as you drive down the road, losing the seal.

So that you have room to tighten them later, the springs on those mounting bolts should not be compressed all the way. However the bolts also need to be snug enough initially to make the seal and not just barely threaded in. You should not compress the gasket more than 50% on initial install, but it should be compressed a bit.

Try tightening them a bit with a socket wrench (tighten all 4 to an equal depth), then spray the roof area around the AC with a garden hose to see if you still have the leak.

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