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Old 04-09-2015, 09:21 PM   #1
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Join Date: Aug 2010
Location: Beech Island
Posts: 195
Rear Ac Leaking at tubing fitting

Hello all, I had my son and grandson over and they wanted to sleep in the RV. We turned on the AC units for it to cool down and they went to go to bed and found that the rear unit was leaking on the bed. We removed the plastic trim and found a tee with one tube leaking at the tee. We turned the rear unit off and removed the tubes from the tee. I blew in the one hard pex tube and it felt like it was partially plugged. That tube we traced back to the rear drivers side corner where the tube drains on the ground. There was water on the ground where the tube exited so it was not completely plugged. Anyway we hooked it all back up and let the unit run and it started leaking again from the same tube! It ruined there camp out and they are inside the house now.

Ok, now here is my question: Why is there a tee fitting and where do the tubes come from? The one goes to the outside drain I know. If the tubes are damaged how do you replace them?


2008 34FDDS Alpine Limited
Beech Island,SC
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Old 04-10-2015, 07:55 AM   #2
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They are the condensation drain tubes on the Dometic A/C side of the heat-pump. Looking under the unit, need to get on the roof, you can see the two plastic cups [one on each side] that the tubes drain. These tubes can get plugged in either direction--toward the cups or toward the drain end at the rear of the coach. Often a modest puff of breath will clear the tubes----good luck.....If the tube connections are leaking--adding new or tightening the exixting hose clamps should solve the problem.
PS Dometic sells them as a kit [tubes and cups] for around $60.....most of the cost is the two 14" foam roof seals that you dont usually need to replace. The difficulty is that you pretty much have to lift up/remove the A/C unit to replace the cups and tubes--not fun.

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2003 Alpine 40' MDTS
New Braunfels, Texas
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Old 04-11-2015, 07:44 PM   #3
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Location: Beech Island
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I thought so!!

Thanks Old Scout, I was afraid I needed to remove the unit to repair! I can't tell if its the tubing or the plastic tray that is leaking. I will be pulling the unit when I have a few days off!!

Thanks Again Old Scout
2008 34FDDS Alpine Limited
Beech Island,SC
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