A/C leak inside when A/C vents open.

acemyers wrote:
I got up on the roof the other day when this happened. Water is draining properly off the roof into the "drain lines" and off the RV. It hasn't rained in about 2 weeks so I doubt that's anything. And when it did rain, there's no leaks. It's only when I slide the vent holes open that causes it to leak.

Don't open the vents :B

Otherwise......clean the evap cooler and drip pan holes.
Check that A/C unit isn't sitting down on roof restricting water draining

Water (Condensation) is accumulating faster than drip pan can get rid of and is being carried over by fan blower into discharge plenum. When you open the ceiling grill vents it drips out..with vents closed it is getting blown into ducts

In humid (around 50 to 70 percent or higher) conditions we often get condenstion forming on the A/C vents on the ceiling. Especially if folks have been going in and out of the door a couple of times.

I've had it drip on me but it's minimal. I'm guessing it could be worse in near 100% humidity.

acemyers wrote:
I got up on the roof the other day when this happened. Water is draining properly off the roof into the "drain lines" and off the RV.

There are multiple drain holes, so some condensation can be draining properly.
My drain pan seems to have multiple sections in it.
The side sections drain fine, but the rear pan section is filling up and dripping inside.
I still think it could be one of the drain holes.
Of course I could be wrong also. :)

I got up on the roof the other day when this happened. Water is draining properly off the roof into the "drain lines" and off the RV. It hasn't rained in about 2 weeks so I doubt that's anything. And when it did rain, there's no leaks. It's only when I slide the vent holes open that causes it to leak.

dan-nickie wrote:
Old-Biscuit the diagram seems to be missing the drain holes.
I guess they are in different locations depending on the unit.
Mine were not easy to find.

Diagram is just a generic scheme.

I had to shift my evap cooler out of frame in order to get to the drain holes in drip pan.......I removed drip pan and enlarged the drain holes.

Just a side note....if roof gasket is over compressed it can cause the drain holes on drip pan to sit on roof and not properly drain also.

Old-Biscuit the diagram seems to be missing the drain holes.
I guess they are in different locations depending on the unit.
Mine were not easy to find.

A guess, the fiberglass stuff is mis-located duct insulation, you may be getting condensation in the duct. Maybe.

Me too.
I haven't been up there yet, but I suspect some of the small drain holes are at least partially stopped up on the roof.
I think that opening the vents on the sides allows the cold air to go right back up into the unit and creates more condensation.
We are not using ours right now, but I plan on getting up there and cleaning out everything soon.

We had a similar leak last year and that took care of it.

Water leaking into rig from A/C unit can only be two things.....

The roof gasket is not sealing...either because the 4 hold down bolts are loose, gasket has been over compressed...water from rain or washing rig is pooling around A/C unit and leaking in thru gasket.
The 4 hold down bolts can be accessed by removing the whole ceiling grill and then tightening the bolts.......just snug not wrenched tight.
If gasket has been over compressed then you will need to replace gasket. Disconnecting power to A/C unit, removing hold down bolts and lifting A/C unit up out of roof opening.

The other source of water is from evap drip pan drain holes being plugged and not allowing condensation from evap cooler to drain out onto roof and run down and away.
You have to remove A/C shroud then remove metal cover over evap cooler and clean drip pan drain holes.

The fiberglass material sounds like the return air filter....should be cleaned and/or changed frequently. Dirty air filters cause restricted air flow and can cause excessive condensation