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Old 10-20-2009, 07:34 AM   #1
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AC Drain Not Draining

I have a Dometic Roof A/C unit that is draining onto the roof instead of via the drain line. Any tricks or things to look for to fix the situation?

BTW the other 2 roof A/C's are draining normally



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Old 10-20-2009, 08:21 AM   #2
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Hi Pat,
Determine where the line exits underneath the coach. Try blowing air from the bottom up toward the top of the coach. Maybe you can dislodge the blockage.

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Old 10-20-2009, 08:29 AM   #3
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Thanks I think I found where ii drains, just aft of the battery compartment. I'll give that a try.

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Old 11-03-2009, 03:27 PM   #4
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Be careful with high pressure air as you could blow some of the fittings and now you have a leak problem.
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Old 11-04-2009, 12:50 PM   #5
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Use low pressure air, maybe 15-20 psi, so you don't blow the inlet apart at the a/c end or burst the drain hose. Alterantively, pull the cover off the a/c and try to see where the drain hole is in the pan. It probably just has leaf residue or mold clogged in the outlet. Clear it away ad pour a bit of bleach+water solution down it as well.
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Old 11-07-2009, 09:02 PM   #6
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AC Unit

Do all roof mount AC units have drain valves? I have a 2009 Winnebago Chalet 31J. I've had my RV for 8 mos now and just assumed they all drained out onto the roof. I guess I've been missing something.

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