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Old 05-20-2019, 06:25 PM   #1
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Rain water leak

Last weekend we were riding in our 2014 Winnebago Sightseer which if your not familiar is a class A. It was raining hard and we were riding about 60mph and DW who was sitting in passenger seat said we have a water leak. It was dripping out of the air conditioner vent over her head. Not a lot of water but dripped for about 10 minutes. By the way we did not have the roof top ac running and it had not been run in a couple of weeks.

When we got home after the weekend I went up on the roof expecting to find I needed to reseal something in that area but everything looks good. My question to you is, is it possible that water could come in thru the rooftop ac unit and get in the duct? I have driven in heavy rain before and never had water come out of the ac duct. I did not think to stop at the time to try to determine if it was coming from inside the duct or around the vent opening. Any advice would be appreciated.

Mark
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Old 05-20-2019, 06:37 PM   #2
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Your roof A/C unit has a gasket to the roof that may require replacement ; OR; the mounting bolt for the unit may be in need of re-torquing .
If you have the owners /installation manual for the units , it will have the torque spec listed.
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Old 05-21-2019, 10:33 PM   #3
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If your roof unit is a Duotherm Briskair, the thumbscrews should be tightened to 40-50 lb/in; OR until the tab on the gasket shows it is compressed 1/2 original thickness.They should be re-torqued every year for the first 2-3 years from purchase or gasket replacement..

The torque values differ by make and model, the installation manual has your specific value.
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Old 05-22-2019, 06:18 AM   #4
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Many motorhome roof A/c units that are ducted do not actually use separate ducting but rather just make channels in the ceiling insulation. Thus, the leak could be from somewhere else and just manifesting itself at an A/C outlet. If you have diced roof A/C which it sounds like you may have, check other openings in the roof. If not, probably the A/C gasket

On rereading your post I see that you have basically the same mh we do. Our A/C is “ducted” via channels cut into the foam insulation and does not use actual separate ducting. I suspect yours do as well.
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Old 05-23-2019, 06:23 AM   #5
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Could it have been condensation? You were in a 100% humid situation.
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