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Old 12-08-2022, 01:04 PM   #1
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Front Cap Dripping, But We're Under An RV Cover

We have water dripping out of the holes on the bottom of our front cap but we are under a cover so it can't be rain. The AC is on the down slope on the other end. I pulled the trim down in the closet and felt some water against the inside of the cap. My guess is condensation but this is a first.

Can anyone say where it's coming from?
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Old 12-08-2022, 04:18 PM   #2
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water intrusion can be a fickle thing to run down. even though the AC water appears to be draining eleswhere, you could have a leak at the AC seals that is allowing some water inside, and once that happens it can appear to be coming from nearly anywhere as it works its way to the ground (gravity). I would start with any seals for AC or fans on the path that the AC is taking to get off the roof. Its also posible you have an interior water leak that is working its way to the front cap and down (again gravity). Check out all sinks, fixtures, showers and toilets for any sign of leakage. As an aside and to further frustrate the issue, I have a friend that found a nail through a water line in their RV. Water was leaking but no where close to any fixtures or drains. Good luck with your issue
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Old 12-08-2022, 04:33 PM   #3
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It always helps to post what RV you're talking about, so people don't have to review your profile to see what you're talking about. Without knowing what AC units you have and if they're ducted, when was the left time you tightened the four bolts that seal the AC unit to the roof. A small turn of the bolts will squeeze the foam seal.
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Old 12-09-2022, 06:05 AM   #4
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Thanks guys. We have a 2010 NUWA Hitchhiker Discover America and the. AC is a new Coleman Mack. Haven't observed any leaks other than the cap and the AC is located on the opposite end of the roof on the down slope so I can't imagine how water would run up to the front cap.

Still trying to figure out what it could be. There are no water lines near the bedroom (front bedroom).
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Old 12-09-2022, 06:25 AM   #5
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@scotttkd is exactly right. Just to add to what he said, I learned the hard way that water can sometimes make its way UP. Not far, necessarily, but surface tension and a little wicking...

And it definitely can run pretty far from the point of entry/source, given the right conditions.

Just food for thought. Take your time and observe carefully; question your assumptions. (I don't mean that in a snarky way - just that sometimes you can rule something out too quickly...)

Do you have lots of condensation elsewhere in the rig?
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Old 12-09-2022, 06:42 AM   #6
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Are the four a/c mounting bolts properly tightened? They should be tight enough to compress the gasket but not so tight as to deform the gasket.

A primary rule of troubleshooting a problem is to always look first in the area you last worked.

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Old 12-09-2022, 07:11 AM   #7
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You have to figure out first if this a Condensate issue, or a Fresh Water issue?
I know that where we are in Fla. the morning moisture on the roof is as heavy like rain. There is constant drips off the Front Cap until the sun dries it up. You may have to get up on the roof and check the caulk for cracks, especially where the rubber meets the Front cap.

Do you have City Water hooked up to the trailer?
Have you checked the bathroom water lines?
Do you have a Washer in the Bedroom? If so, check these lines.
Good Luck with your search.

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Old 12-09-2022, 07:36 AM   #8
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Run the AC fan at slow speed to provide better dehumidification. Always run exhaust fan when showering/cooking.
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Old 12-09-2022, 09:05 AM   #9
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I would cut the fresh water supply off for a good length of time to see if the leak stops. Once you eliminate that possibility, you can move to the next which could be the AC or perhaps a drain pipe.
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Old 12-11-2022, 01:39 AM   #10
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Thanks everyone for your advice. Going to look everything over.
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cover, front cap

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