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Old 12-12-2005, 02:40 PM   #1
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Coleman AC Leak Fix

This has been written in several parts, it might be hard to
follow. I'll post more and answer any questions. Please
add to this post if you have questions or any input.

If you have a Coleman AC that leaks like an Amazon rain storm I
think I know your problem. If you have this problem you know exactly
what I am talking about, this is no ordinary condensation problem.

First check to see if you main drain pan is clogged or the drain hose
is clogged. DO NOT use compressed air to blow into the hose if
you find that it is clogged. Use your mouth. It's not going to kill
you. If the drain hose is not clogged and no water or very little water
is draining through the hose then it means that the pan is probably
clogged. If it's raining in your Airstream and no water is coming
out of the drain hose then I know you have clogged drain pan.
If the main pan clogs the water tends to run off the roof.

What happened is that during the istallation of the AC unit they put
tape and rubber sealing material under the drain holes of the pan that
is directly under the evaporation coil. I tried drano and everything trying
to fix it and resorted to taking the whole thing apart one day in a fit
of frustration. Started at noon, sitting in ICE! cold AC with no water
by 3 PM.

Here's how:

-1. Email Me and ask all the questions. If you are in FL drive it
close by and I'll offer to do it for you.

0. Power down the Airstream, and make sure you have your common
sense hat on tight.

1. Take the bottom of the AC unit out by taking the plastic shroud off
and then removing the bolts that hold the AC down.

Warning. if you weigh over 120 lbs do not attempt the following without
something to support you weight or you will crush the roof! Ask a pro.
about this since I am in no position to give advice on this.

2. Take the top plastic part off the AC unit on top and tear into the metal
case using a screw driver and a knife to cut the aluminum tape. This
takes some time and effort.

3. locate the evap coil, it should be right in front of the unit next to the
big turbine ( squirrel cage ) fan. Next locate the plactic pan under this
coil. It will be full of water. The big drain pan that contains the whole
AC unit should be empty.

4. Gently, Gently lift the coil out of the pan, it's on flexible hoses so it
should move easily. Be really careful. Just move it enought to pull
the pan out. It might be taped.

5. Cuss like a sailor when you see the tape covering the drain holes in
the pan!

6. Put it back together. Smile that you saved $1000 on a new AC.

Again, please email me before you attempt this and I can walk you
through it on the phone or something.



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Old 04-22-2006, 07:23 AM   #2
1989 29' Excella
Dallas , Texas
Join Date: Sep 2004
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Thank you for this thread. My '89 Excella had just the symptoms you described. In my case the upper pan drain holes had not been taped over but just enough crud had collected around the drain holes to keep it from draining.
Until I read your thread I thought I would have to replace the unit. Working fine now though!


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Old 04-22-2006, 08:53 AM   #3
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1973 23' Safari
North of Boston , Massachusetts
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hmm.. I didn't even know there was a way to connect a Coleman a/c to the drain hose. mine just drips onto the roof, and runs down the side.

Wbcci: 3752
'73 Safari 23'
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Old 04-22-2006, 10:14 AM   #4
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San Angelo , Texas
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There is a Coleman model, which will connect right up to the drain hose. Though I can't remember the model, Ron at South Jersey RV told me about it.

1971 Sovereign International - SOLD

2004 F-350 King Ranch

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Old 07-14-2009, 10:07 PM   #5
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1990 29' Excella
Los Angeles , California
Join Date: Jan 2009
Posts: 19
unbelievable!! this was one of those instances where i assumed i'd be the guy to go up top of my 90 excella looking for this 'tape' and find out there was some other super complicated reason my unit's been leaking like the dickens. socal's been heating up these last few weeks, and today i'd had ENOUGH of my rainy coleman. i waited til 530pm when it started to cool down, and then went up to the roof and followed your instructions. sure enough THERE WAS TAPE COVERING MY HOLES!!!!!!!!! why on earth??? anyway, tape's removed, i checked for proper drainage, and had it all back together well before dark. tomorrow i'm gonna fire up the a/c and see if i can put away this umbrella

thanks for the insight
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Old 07-19-2009, 10:43 PM   #6
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I haven't read this thread in 4 years since I sold my Airstream to my parents but I knew that one day someone would have the same problems. I knew that one day someone would find it and find the exact same problem.

Congratulations on being hard core enough to fix it!

Now go buy something nice with all that money you saved. My parents have used mine since the day I sold it to them with not a single problem with the AC.

I bet we can track this problem down to the day/month/year on when they were built and then track down the person that made this horrible error.

Take care and thanks for making my evening.

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Old 06-01-2011, 06:20 PM   #7
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1989 32.5' Airstream 325
Carmel , California
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AC Fixed...but we need the drip pan


We have fixed our Coleman AC by doing what you said...but now the pan under the whole unit needs to be replaced. We've fixed it by using sealant everywhere, but eventually we need a new one. Any idea where to find these plastic pans for a Airstream RV 325 1989?
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Old 06-02-2011, 12:36 AM   #8
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1989 34.5' Airstream 345
Cleveland , Tennessee
Join Date: Jul 2007
Posts: 787
cyberstream, you'll have better luck finding the part number by listing the AC model # instead of the AS MH model.


"Sometimes I wonder if the world is being run by smart people who are putting us on, or by imbeciles who really mean it." Mark Twain

AIR 22749 WBCCI 2349 NOVA TAC TN-6
1989 345 LE Classic Motorhome
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