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Old 08-21-2012, 08:15 PM   #1
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It raining inside

I have a new Phaeton that my wife and I are really enjoying this year. It is built on a Freightliner chassis. One issue however is that while traveling on the road using the chassis powered air conditioner, we experience very heavy condensation on the duct work under the dash - so much so that we have to put towels down on the floor to catch all the "rain". The a/c checks out fine relative to presure differentials and air flow and thermostatic control of the evaporator to prevent it from freezing up.

My only remaining possibility is an air leak from somewhere at the front of the coach that is coming in under the dash which is being blown across the ducts and as this is warm humid air, it condenses on the ducts.

The fresh air duct is kept closed during ac operation.

So.....where is the air getting through? Can't find anything obvious so any suggestions on a "hidden air passage?
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Old 08-21-2012, 08:21 PM   #2
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My parents had a 1963 Buick Electra that would throw ice chips out the vents. Boy did that cool the interior down quick!!

The next year they cut back on the cooling capacity and the "problem" went away.
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Old 08-21-2012, 08:32 PM   #3
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Have you checked the condensate drain to make sure it open and draining water accumulation?

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Old 08-21-2012, 08:33 PM   #4
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Sure wish I had that problem!
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Old 08-21-2012, 08:35 PM   #5
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I did and there does not appear to be any blockage. Even put in a couple of baffles around the drain under the hood to be sure the ram air wasn't causing the water to back up. That did not seem to make any difference.
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Old 08-21-2012, 09:45 PM   #6
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I'd call Tiffin service at 256-356-0261 and ask them. Sounds like a warranty issue.
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Old 08-22-2012, 08:49 AM   #7
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I spent the day in Red Bay yesterday at Bay Diesel checking out the AC system but all was found to be OK. Will by at the FMCA rally next week so I'll seek the Tiffin folks out there to check things out further.
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