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Old 01-12-2021, 10:55 PM   #1
Junior Member
Brand: Thor Motor Coach
Model: LH26
State: Arizona
Posts: 1
THOR #21804
Air infiltration

Hello fellow Thor Class C owners. I just purchase my first Class C Motor Coach. To this point I've only owned bumper pulls and 5th wheels. Wanting to downsize and pull my Jeep Wrangler JK we opted to buy a 2021 Thor LH26. So far we really like the rig. However, we have been traveling during a cold spell and find there is more than appreciated cold air coming in to the coach both when travel and set up. Seems to be from the skylight area in the front cap and where the E450 cab joins the living area at the floor. Other than a few other minor things I need to get fixed by the dealer, it has been a great rig/experience so far. I'm just wondering if any one else has experienced this and if so, did you find a fix or is it just a normal occurrence with the Class C body style?

Appreciate any information you might be able to share!



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Old 01-13-2021, 12:36 AM   #2
Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 1,185
THOR #11781
That should not be normal. None of my prior class c coaches had that issue, but they weren't Thors either.

Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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Old 01-13-2021, 03:00 AM   #3
Senior Member
Brand: Still Looking
Model: Newmar Bay Star Sport 300
State: Alabama
Posts: 3,038
THOR #6826
You need to do some research. If there is actual airflow through the roof/ceiling then there also will be water - or the potential for it and thatís very bad! Iíd wander around with a lit candle on a windy day and see if there is any flicker of wind. If so get to the outside of the area and inspect it very carefully so that you can seal up any suspect areas. Too few people know that you need to inspect and reseal at least a couple of times a year. I do it every few months and rarely fail to find something to address. Catch it early!!
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Old 01-13-2021, 04:56 AM   #4
Junior Member
Brand: Thor Motor Coach
Model: Four Winds 30D
State: Washington
Posts: 9
THOR #21409
I had squeaking from movement between the cab and the coach on my 2018 Thor Four Winds so dropped the upholstery and found that they used Styrofoam blocks in the upholstering. The bolts were loose so I put star lock washers on them and reinstalled them - after resealing the entire area where the cab an coach met because you could see daylight and feel wind blowing through there. Because it's so easy to drop the cab ceiling upholstery to get the access you need I went ahead and reassembled it after resealing it and putting some rubber between the Styrofoam and the cab metal so I could see whether that would do the job. We drove it about 10 miles and it was quiet as a mouse, so we'll see how it holds up. To reseal it I pulled all of the bolts and ran a heavy bead of siliconized acrylic caulk (not to be confused with silicone caulk!) between the sheet metal of the cab and the fiberglass of the coach, and then reinstalled the bolts that I had added star type lock washers to. I didn't set out to fix any air drafts but man did sealing that gap make a big difference. Just another example of good products suffering from poor workmanship. It's all fixable though.

Here's a photo where you can see the screws around the cutout and the white Styrofoam sitting up on top of the mats.

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