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05-25-2021, 06:23 PM
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#1
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Seasoned Camper
Join Date: Nov 2019
Location: Calgary
Posts: 59
M.O.C. #25402
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AC leaking
Rained hard for about 12 hours yesterday, and we noticed a small leak coming thru the air conditioner return air vent of our 2020 294RL. It's a whisper quiet model with heat pump and the leak is only coming thru the curb side vent. I suspect the AC seal is the culprit but have not gone up on the roof to check yet. Because of the long lead-time for dealer repairs I'm wondering has anyone ran a bead of caulk around their AC seal, bonding it to the roof. Any cons with doing this?
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2020 294RL
2019 GMC 3500HD 6.6L 4x4 SRW
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05-25-2021, 10:12 PM
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#2
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Seasoned Camper
Join Date: Dec 2019
Location: Boise, ID
Posts: 85
M.O.C. #25489
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I'm not sure about the caulking. However, i would first go up on the roof and take the shroud off the AC and check that the condensate drains are not plugged up. Then go inside the trailer and check that the four mounting bolts have not loosened up. I've heard they should be snugged up then about half a turn more. Over-tightening may be as bad as under-tightening. hope this may help.
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Joe & Rita, Boise ID
2014 3402RL, Morryde pin box, dual AC
2020 RAM 3500 Mega, Dually, 4:10, HO CTD, Aisin.
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05-26-2021, 12:40 AM
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#3
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,700
M.O.C. #12947
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If I’m not mistaken, the A/C units on the newer models are mounted differently than the older ones. I think they are secured with bolts from the top.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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05-26-2021, 06:53 AM
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#4
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Exactly, lugs screwed directly into the roof.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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05-26-2021, 08:17 AM
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#5
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Montana Fan
Join Date: Nov 2019
Location: Roseville
Posts: 265
M.O.C. #25257
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We had that with our 2020 MHC 381TH. It was the drains in the AC unit.
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Jim and Carole
Roseville, MN
2018 RAM 3500 DRW, Diesel, Long Box, Air Lift Bags - 2020 Montana HC 381TH, Sailun S637 |
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05-26-2021, 10:12 AM
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#6
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,888
M.O.C. #19944
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Our 2020RD had the same issue - mobile RV tech with 30 years experience, came out - pulled each lag screw, shot DICOR in hole and re-torqued. then covered head of lag screw with DICOR caulk - no more issues. Did have another occurrence where condensate drain was plugged with construction debris - this cause blowing out ducts.
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 RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC / IS / MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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05-26-2021, 12:02 PM
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#7
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Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 964
M.O.C. #17801
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I think your problem is not the AC to roof seal, rather it's what's described in an old thread entitled "Major Roof Repair on 2016 - Input Please."
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