Air conditioner drain lines plugged?

[redbaron]

I'm a little confused. As far as I know, on our coach the evap condensation just runs out of the base of the unit on to the roof and down the roof drains. No pump or drain lines.

You’re right, I explained that in #6 above.

My guess is the intrusion is not related directly to the air conditioner, but more likely the radio antenna or other rooftop items above driver.

 

[GUS2000]

we have a similar issue in our DS4369 and in the bedroom only... it go to the point where water was even dripping from one of the lights in the ceiling.. no rain just condensation from the ac.. last year when we were at Newmar they pulled the rear most AC and cleaned it out and resealed everything... so far we only get a small drip of condensation forming on the grill depending on how humid it is... whats weird is the front ac runs 2x as much as this ac and never had any issue like this.. so thinking if it does it again, there is something with this specific AC thats not draining correctly as the other two never show this issue..

 

[lostinfla]

Just so happens, I was up on the roof early this am to clean the coils and while in there I had a thought. If the pan below the evaporator is cracked, it will leak water into the plenum and inside the coach instead of following the drain route. Not sure if this is the issue, but it is a possibility. (This pic is before I cleaned it)

 

[CaptainGizmo]

Sorry for introducing any confusion or incorrect guidance regarding having a pump.

It’s clear from @redbaron and @lostinfla that they do not…I apologize for the wrong “rabbit hole”!

But, if ya didn’t have a leak in that pouring rain, and ONLY when a certain AC is on, then yeah…sure sounds like a clogged and/or leaking drain line, pan, or pan to roof seal.

I would be inclined to try to isolate by working from the outside, inward; pouring water around the housing, then around the pan, then in the pan.

Help ya get it!

 

[Jim]

Sorry for introducing any confusion or incorrect guidance regarding having a pump.

It’s clear from @redbaron and @lostinfla that they do not…I apologize for the wrong “rabbit hole”!

But, if ya didn’t have a leak in that pouring rain, and ONLY when a certain AC is on, then yeah…sure sounds like a clogged and/or leaking drain line, pan, or pan to roof seal.

I would be inclined to try to isolate by working from the outside, inward; pouring water around the housing, then around the pan, then in the pan.

Help ya get it!

LOL, yeah, there’s always going to be some confusion when dealing with this stuff.

I talked to an RV tech at the park where I stay, and he agreed that newer rigs probably do have a pump. That said, neither of us could figure out why anyone would want to add another layer of complexity to something that’s worked just fine for years without one.

I don’t think it’s a broken pan like @lostinfla suggested, though I suppose it’s possible. But we ran the A/C for the full 10-hour trip, and not a single drop of condensation showed up. If the pan were broken, or leaking, I think this would have been a good time for it to leak. So yeah, it looks like I’ll need to put some time into this mystery, but these days, time’s harder to find than a good politician.

Anyway, I’ll get it sorted. Just going to take a little effort.

 

[GUS2000]

Well we started having water dripping in the bedroom today from AC drainage... i pulled the vent cover off and the ring with the foam on it was soaked... no water in the vent but definitly alot of water between the ceiling and the duct... have a mobile tech coming out to see what the source is... Mothership said they fixed this issue last year.. but apparanly they didnt...

 

[Stuart W]

What I have found is depending on any slight lean the coach has the water will flow to that side. I’m sure you have experienced when getting ready to travel and jacks retracted water will sometimes poor out one side
As for compressed air to clear the lines, I agree with RB on 30 psi or water from the top with drain grids removed.

 

[GUS2000]

Here was what i found in our coach when i took the AC off of the roof.. one area that was not taped correctly at the factory that was allowing cool air to enter into the attic space and cause condensation to form on the outside of the duct and then travel and drain in the bedroom ceiling.. after this was corrected we have seen no more issue with water collecting in the ceiling..

Here is the inside of the ceiling while before the area was sealed

Here is the inside of the ceiling 24 hours after being sealed... almost all the water has evaporated and no new water pooling seen..