Question about Dometic Rooftop RV Air Conditioner

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How to fix rooftop air conditioners to drain properly i.e. down drains at front of the coach?

We have had this problem continuously and in for repairs many times. Dealer says there is no fix which we find hard to believe.

Posted by Anonymous on

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  • Contributor
  • 42 Answers

On most coaches the air conditioner simply drains onto the roof. There are multiple openings on most base pans for the water to drain out, so a single hose will not normally solve the problem. What I have done in the past is use rubber roof caulking to make directional dams, routing the water where the customer wanted it to run off. Gutter extensions can help also, making the water drip away from the camper instead of running down the sides. A clothes pin, clipped onto the end of the gutter, can help a lot too.

Posted on Apr 07, 2015

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  • Dometic Master
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I would try to find the "drain", connect a hose of some kind to it and direct the hose to the back. Air over the top and back should continue to push it in the rearward direction. If no drain I guess I would "shim" the front so the front of the pan was higher than the rear, which I would guess would do the same thing. If stopped, I would be sure the front of the vehicle was considerably higher than the rear.

Posted on Apr 06, 2015

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1 Answer

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Your drain pan is plugged up and allowing the water to rise above the edge of the pan and into the coach. The best way to repair this is to get on the roof and lay down next to the air conditioner. Look underneath the unit and you should see two white nipples sticking out the bottom about 1/3 of the way back from the front. These are the drain ports for the pan. Take a wire hanger or a long pick and work it into the hole of the nipple. The hole is kind of small and it would not hurt to open it up a bit. If you are unable to access the nipples in this manner, then the AC has to be removed and stood up so that the pan can be cleaned.

Hope this helps,

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P.S. The reason that it is only leaking during the day is because the evaporator creates more condensation in the hotter parts of the day than at night.

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