Moisture dripping from ac

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New member
Oct 30, 2012
The front Dometic ac in my fifth wheel will drip some water out of the return vent when the ac is turned off in the morning. The ac unit is ducted and has the return grill in the ceiling. I have had RV techs to checkout the problem and so far no one can figure out what is causing the problem. The drip holes in the unit are totally open and are large enough that stoppage could not occur. The amount of water that drips out is approx 1/4 to 1/2 a cup.

Does anyone have any idea about what may be causing the problem?


Well-known member
Jun 28, 2010
It could be freezing up then melting when you turn it off. Most common problem is inadequate air flow. Clean the filter, check for obstructions,clean the inside coils and outside coils. Are you running the fan on high speed. Sometimes low speed will cause it ti freeze up.

Second possibility is low refrigerant which means a trip to the dealer for warranty replacement.         

John From Detroit

Well-known member
Apr 12, 2005
Davison Michigan
There are two problems that cause that.. The other poster hit one, Ice up, I have had that happen a time or two to me.

But the more common one in my case is bad leveling of the RV.. I now hae two different Air Conditioners.

IF the RV is "Nose down" at all, water, flowing down hill, flows over the front lip of the drip pan.. Raising the nose fixes that for one A/C. on the other one, I may also need to tilt more toward the driver's side (As that's where the drip outlet is)

I do not know where dometic put therirs.

It is posisble to modify the drip tray on SOME models, not on mine, for a lower water level.
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