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Old 06-22-2014, 10:26 AM   #1
The George Miller
2015 25' International
Santa Rosa Beach , Florida
Join Date: Apr 2014
Posts: 4
Air Conditioner leaks water

New to Air Forum any comments will be greatly accepted.

Recently purchased our 1986 25' Excella. Seller disclosed some minor areas needing attention... A new Coleman roof mount a/c has been installed less than 2 years ago. AS keep under shelter, we picked the unit up in middle Florida and took it home. Hooked power to unit and turned on ac. Cooled even got to cold in unit but the ac started to leak, actually leak is an understatement. Question, is there a drain hose that may not be hooked up?????
Second ac leak: had a great first time out trip, Destin to CT. and back over a ten day period. No need to run ac also experienced a lot of rain, no problems. Get home and leave on business, two day Florida rain event, get a call Airstream has water in it from a leak around ac unit, possible the outside seal worked lose?
thank you,
Destin, Florida

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Old 06-22-2014, 11:10 AM   #2
Rivet Master
Belegedhel's Avatar
1973 21' Globetrotter
Houston , Texas
Join Date: Sep 2009
Posts: 1,902
In a "factory" installation, your AC would be installed in a plastic pan that catches the condensate and channels it into the condensate drain tube that runs inside the wall. As far as I know, these drain pans are made to fit Dometic Penguin ACs, so one of several poblems that could be traced back to the installation could causing your leaks.

1) Your new AC might be installed in the original plastic condensate pan. The condensate drip holes on the AC might not line up with the channels on the pan, and therefore water is not being channeled down the drain properly, and instead is ending up overflowing the pan and dripping into your trailer.

2) These pans also have several holes drilled around the base of the exterior to allow water to drain out that has gotten inside due to rain. If some overzealous technician has sealed up these holes with caulk, then the pan will overflow, and the only place for it to go is inside your trailer.

3) In the even that there is no plastic pan, then it could be your AC is plumbed into the condensate drain in some other way. If the condensate drain tube is clogged up, then maybe the water is backing up and overflowing into your interior.

4) Your foam rubber seals that do all of the sealing of the AC to the roof, may not be tight enough, or they are in bad shape. Bad seals might explain the rain water getting in, but I think your rain water leakage and condensate leakage are related--see point 1 and 2 above.

So, step 1, figure out whether your AC sits in a condensate pan or not. It is hard to tell just by looking at it from the ground. You will need to get up close to the AC so you can tell if the base of the AC is sitting directly on the roof, or if it is in a plastic pan. The base of your AC should be metal, so if you see plastic, it might be the condensate pan. If you have a pan, then check to see if the holes along each side are clear, of if they have been sealed, or plugged by schmutz. Also inspect the condition of the pan. Sometimes a cracked pan can result in water leaking into the interior.

Step 2, you will have to remove your ceiling assembly so that you can look up into the guts of the AC. From here, you should be able to see where the condensate tube and any draining mechanism meet. Run the AC for a while and see if you can see where the water is leaking from. If the condensate tube isn't hooked up, then the problem is obvious. You should also be able to see the condition of the rubber seals that keep rain water out, and your cool air circulating inside the trailer. There should be three or more long bolts that clamp the AC to the roof. Check how tight they are. Also, confirm that there are spacers present in between the interior and exterior skins where the AC installs. If there aren't any, then you need to make some, as your AC isn't really clamping against anything but the interior sheet metal.

good luck!
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