Question about Dometic Rooftop RV Air Conditioner

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I have a leak and it does not seem to the be the new gasket

I have a leak and it does not seem to the be seal or the weep holes - could it hurt to calk around the new gasket? I have tightened the 4 bolts as well. The only other option is the seam where the roof halves meet under the AC. The leak is at the back edge somehow but there is no water IN the AC unit. This is rain related.

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Mine did the same thing as I have it installed on a trailer that didn't have enough support. You can pull the cover, have someone stand inside and gently spray a mist of water around. I gently sprayed water all along the gasket and found it that way.I found that mine leaked at the seams that you are talking about. I just installed a thicker gasket but you can caulk it. Hope this helps and hey, when you're spraying the water, keep it away from any electrical connections as you know the consequences :>)

Posted on Jul 03, 2009

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They say you should only compress the gasket to approximately 1/2 it's original thickness, and sometimes there are tabs that touch roof to tell you that's far enough. If your sure it's coming in around gasket where it meets roof, try loosening bolts off to allow you to lift upper unit off roof enough to use a caulking gun with a tube of "dicor" self leveling sealant, and run a bead of Dicor around where gasket meets roof , then set unit back down, & tighten until gasket is about 1/2 thickness as new.I always find it better to remove bolts & flip unit on it's side and get good bead down center of where gasket meets roof, then set unit back down, line it up & snug it down.Let it sit for a while to set a bit. Be ready with a rag to catch or wipe any excess that squeezes out from under gasket to the inside, that may end up on floor below, as it's very hard to remove that stuff after the fact.Has worked for me in similar situations.

Posted on Jul 01, 2009

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