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Old 07-17-2019, 05:35 PM   #1
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Join Date: May 2017
Location: Slidell, Louisiana
Posts: 20
Air conditioner drain line

Has anyone replaced the pex pipe ac drain line that runs in the roof to the front drivers side? If so any details?
Bob & Linda Goodwin
2003 Alpine 40 FDTS
Slidell La.
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Old 07-18-2019, 01:23 PM   #2
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Join Date: Feb 2019
Location: Walton, KY
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I was just about to start a thread on this as I am currently working on mine.
The rear unit did not drain and I followed a suggestion to hook up a vacuum to the drain tube exiting in the engine compartment left side. Did the same with the front. I could hear the air hissing inside but no luck they did not drain through the pipe but still on the roof.
I then opened the rear unit and the piece of tubing going from the T-Connector the the drain cup had dried up suff in it. I squeezed it by hand and now it drains just fine.
However in the front I found to my surprise that the drain cups and tubing to them was completely missing.
The pex tubing runs in a separate channel inside the roof above the roof truss. So in the foam section between the metal truss and the outside roof sheet.
In the rear there is a 90 elbow right on top transitioning from horizontal to vertical down. If this is the case in the front as well then I think it would be very problematic to pull a new tubing as the elbow will not make it down the window channel.
Idea ... maybe you can insert a smaller tubing into the existing one and try to run that up ... needs to be flexible though.
Why do you think you need to replace it Pex is pretty much indestructible?
Here a pic from the front AC open
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2006 Alpine 34 FDDS
2013 Honda CRV
Blue Ox, Patriot
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Old 07-20-2019, 04:00 PM   #3
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Location: Slidell, Louisiana
Posts: 20
I discovered a leak at the front left corner while changing out my flooring. I thought it was the drain line. It did drain but not as much as the rear. I posted this prior to removing the ac unit. Upon removal I found the cups that that capture condensation were cracked at the hose connection. I capped one end of the coach internal drain line and pressure tested it. The line did not leak.So I'm thinking the condensation is running out on the roof and is leaking in though the belt line molding. I can see gaps in the molding. I'm going to clean and reseal everything.
Bob & Linda Goodwin
2003 Alpine 40 FDTS
Slidell La.
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Old 07-23-2019, 11:56 AM   #4
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It is a condensation line. I sometimes spiders and such will crawl up inside to build a nest. I have not has that problem, but I have heard that if you blow some high pressure air through the line, it could knock out any blockages. Good luck
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Old 07-27-2019, 04:01 PM   #5
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Location: Washington Illinois
Posts: 25
I just cleaned my drain tubes out. The rear tube I just took a small air compressor and
blew the line out. Worked great it exited by the coolant tank at the back of the coach.
The front line I had to cut the line and blew it out both ways. It was hard to find a connector to join both pieces back together. I did and it exited out the passenger side of the coach underneath about half way down. I have a 2002 40' Alpine coach. now all clean and appear to be working properly.


40' Alpine 40' ISL
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air, air conditioner

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