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Old 10-27-2013, 10:16 AM   #1
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2002 22' International
Austin , Texas
Join Date: Feb 2007
Posts: 209
Question Leak from A/C after Storm

Is it possible for hard rain to somehow be blown in the A/C from outside and then be caught in the drip pan to then drain out the tube to outside? I always thought the outside and inside parts of the A/C were separate and sealed from each other.

Today, after 1.5" rain last night, we have a wet floor under the A/C. After taking the inside cover off, I found wetness under and around where the drain tube comes from the drip pan. I ran a wire snake from outside up the drain tube - a good deal of water came out by the tire. We have NOT used the trailer in over 7 months so the problem came from last night's rain. If that tube were not blocked and functioned correctly, then chances are I may have never have noticed this leak.

I guess I will crawl on top and try to inspect for broken caulk, etc.; but I am afraid I won't be able to see anything.

What's my next step for diagnosing this problem before I leave tomorrow on a trip?

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Old 10-27-2013, 12:25 PM   #2
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2002 22' International
Austin , Texas
Join Date: Feb 2007
Posts: 209
Unhappy Onward to Seal the Top.

I crawled on the roof, removed the A/C cover and peered inside. I could not see any place that looked like a leak point from the exterior to interior of the trailer. There was water puddles in there around the motor, etc., but I suppose that is normal. No way for me to tell if the caulk around the base of the A/C is in good shape or not.

I went to Home Depot, purchased some white poly urethane sealant and will apply it around the base of the A/C, hopefully to get us by on this trip. Later, I will have to investigate what the best sealant is for the top of the trailer and then just redo the whole works.

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Old 10-28-2013, 09:18 AM   #3
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1973 21' Globetrotter
Houston , Texas
Join Date: Sep 2009
Posts: 1,900
If you have a drip pan, then the drip pan will probably have been sealed to the roof with some kind of caulk, and then the air conditioner sits down inside the pan. The AC seals to the pan with a thick foam gasket. The sides of the pan are sometimes stuck to the AC by means of some kind of double stick tape, and sometimes not (so I have read). It is conceivable that in a hard rain, water could run down the side of the AC, and get inside the drip pan.

The pan should have small holes at the bottom of each of the long sides that will allow rain water to drain. It could be that these holes have become clogged and are not allowing the rain water to drain, thus it is getting into the condensate drain area. If the rain water gets into the condensate drain area, then it will try to go down the condensate tube just like condensate. If your condensate tube is running freely, you should never notice any leak. It sounds like your tube had some blockage.

So, things to look for:
-Check around the entire perimeter of the drip pan for damage (cracks, breaks, etc.)
-look for the drain holes in the long sides of the pan and make sure they are not clogged
-ensure that your condensate tube is completely clear
-it is possible that the foam gasket that seals the AC to the drip pan is shot, allowing water to get into your trailer from around the AC. You might have to remove the interior ceiling airbox in order to see the foam gasket and look for leaks in it.

good luck!
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