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Old 01-07-2019, 05:32 PM   #1
sjroark
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M.O.C. #23222
Leak in the intake vent

We have a 2017 Montana high country HM305RL. only when it rains we have a small leak dripping from one of the filtered intakes in the living room. My husband has been on the roof several times taken the cover off and sealed everything he could but it still leaks.
Has anyone else had this issue? Any advice on how and where to fix it?
Thank you!!!!
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Old 01-07-2019, 07:05 PM   #2
1retired06
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Some have had problems with the dometic blizzard two piece cover and unused installation holes allowing rain to leak in. Detailed fixes posted on previous posts, try a search. Don’t have them on our rig, but believe fixes included plugging the extra holes and caulking for the cover. If your AC is blizzard, would start there.
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Old 01-08-2019, 08:08 AM   #3
MidMOTraveler
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Don’t have the same model but our ac unit was not properly centered over the roof opening. Used a mobile service to pull unit replace gasket reposition unit. Took lots of pictures and submitted to Keystone and reimbursed.
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Old 01-08-2019, 08:57 AM   #4
1retired06
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Worth looking at, but generally a bad gasket will leak all the tine, not just when it rains.
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Old 01-08-2019, 09:48 AM   #5
MidMOTraveler
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Our ONLY leaked when it rained and came through the return air vent.
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Old 01-08-2019, 01:33 PM   #6
BuilderBob
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Quote:
Originally Posted by sjroark View Post
We have a 2017 Montana high country HM305RL. only when it rains we have a small leak dripping from one of the filtered intakes in the living room. My husband has been on the roof several times taken the cover off and sealed everything he could but it still leaks.
Has anyone else had this issue? Any advice on how and where to fix it?
Thank you!!!!
If you go to the Dometic web sit they have a fix for that problem or you can find here if you do a surch for A\c roof leaks.
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Old 01-10-2019, 04:29 PM   #7
SteveandTerri
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AC Unit Mount: What a Mess

The Roof Openings on my 305RL were not cut in the right place. They were crooked and too large. The AC Gasket didn't make full contact around the openings. For the most part, only half of the gasket actually made contact with the surface of the roof. The rest of the gasket surface was located over the roof openings.

The worst location: there was no contact at all between the gasket and the roof surface along a 5-inch section of the Supply Air roof opening. The gasket was located completely over the opening in that area.... As a result, rainwater was able to leak into the roof opening and the duct. Water also got to the closest lag screw that secures the AC Unit to the Roof. The lag screw was only fastened to the 1/2-inch thick Oriented Strand Board: there was no framing below it. Due to the leak, the OSB softened and the screw just pulled straight out. All four of the hold-down lag screws were rusted.

The RV Roof Specialist that I took it to affixed framing to the roof deck/structure to reinforce the openings and make them a bit smaller (so that the gasket would make full contact with the roof surface). He also installed a metal frame with "up-bolts" (the frame is attached to the interior ceiling). The bolts extend up into the AC Unit base frame. The AC Unit is now held down with nuts and bolts - not just lag screws coming down from the top side.

I just sent a letter to Keystone describing the issue and requested reimbursement for the repairs...
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Old 01-11-2019, 11:10 AM   #8
SteveandTerri
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Correction: it was the return air opening

Correction: the roof opening where there was no contact between the gasket and roof surface was the RETURN AIR opening. see attached picture
Attached Files
File Type: pdf 20190111 SMiller Underside of AC Unit.pdf (792.9 KB, 49 views)
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Old 01-11-2019, 12:36 PM   #9
MidMOTraveler
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Steve & Terri Yep that’s pretty much how ours looked.
The roof openings were not oversized just not properly aligned.
Major improvement in air flow also after repairs.
It makes me wonder how often this is the issue when folks complain about their unit not cooling?
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Old 01-11-2019, 03:28 PM   #10
SteveandTerri
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I wonder about that and collapsing return ducts. When I first got the rig, the AC hardly worked at all. I found a thread that talked about the return air ducts collapsing near the return air grills. I checked my return air ducts - and sure enough - they had collapsed to about half their normal size. I installed plastic tubes in the return air ducts to expand them to their full size (as recommended by many on the thread) and the AC system then worked fine. When the ducts were collapsed, there wasn't enough airflow through the evaporator coil and (I believe) the coil was icing up. I know another couple that bought a 2018 HC: they found and fixed the same problem.
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Old Yesterday, 05:05 PM   #11
Redskals
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We had the same problem after about 1 year of use. Took to camping world and they said screws were all rusted. Removed unit, sealed around new screws and reinstalled. Over $400 later it still leaks. At a loss for what to do now. Will never buy a Keystone again and not just for this reason.
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Old Yesterday, 07:06 PM   #12
CITRIX43
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Smile

Quote:
Originally Posted by sjroark View Post
We have a 2017 Montana high country HM305RL. only when it rains we have a small leak dripping from one of the filtered intakes in the living room. My husband has been on the roof several times taken the cover off and sealed everything he could but it still leaks.
Has anyone else had this issue? Any advice on how and where to fix it?
Thank you!!!!
I have the same model, 2016, could you send a picture?
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Old Yesterday, 09:50 PM   #13
Kruskop's
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M.O.C. #22567
Same issue with our 2018 3931fb return air on door side in rear living room. Like previous posts, it is the Blizzard style that has the old reverse clam shell type closure fitting. We removed cover, no exposed drill holes so tightened the existing bolts then put cover back together and added duct tape where the clam shell cover meets as a temporary seal fix until we get the newer style cover. So far so good after several hard rainfalls.
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Old Today, 07:28 AM   #14
sjdobbins
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M.O.C. #18509
I have a 2017 370BR that had the same issue and there are a lot of threads and posts on how to fix it. The one that finally fixed mine was the sealing the seam where the top and bottom cover comes together. It is a very poor design. Some have used gorilla tape and others simply caulked the seam with silicon. I would follow all of the previous posts but finally seal the seam in the ac shroud.
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Old Today, 08:28 AM   #15
belldog
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Leaky vent

I had problems with water dripping from air return vent. Had it for service at dealer several times. After several fixes and a new ac leak stopped. Have Dometic wisper air only rear ac leaked
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Old Today, 08:51 AM   #16
Last2Die
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I have a 2018 3920 and it’s going in for warranty service for this and other things.
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Old Today, 09:19 AM   #17
bowlesj
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Quote:
Originally Posted by Kruskop's View Post
Same issue with our 2018 3931fb return air on door side in rear living room. Like previous posts, it is the Blizzard style that has the old reverse clam shell type closure fitting. We removed cover, no exposed drill holes so tightened the existing bolts then put cover back together and added duct tape where the clam shell cover meets as a temporary seal fix until we get the newer style cover. So far so good after several hard rainfalls.

What is this newer style cover you mention above?

Thanks

John - 2016 3820FK
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Old Today, 09:44 AM   #18
belldog
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I had to take mine back several times. Service Mgr said Dometic had several fixes for problems. I guess they still haven’t fixed problems. Mine is 2016 3611 we first had water dripping from return air thought it was from condensation since we are in the South. But on a trip to Montana with snow I decided it not condensation.
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