Rear window leak

DSW1519 · December 16, 2020

So basically, if you have a sliding rear window, it’s gonna leak.

I would have to say odds are the slider will leak. I have to agree with the posts above you have to wonder how many trucks are leaking where owners have no clue.

Since finding my leak yesterday everytime I saw a T1 on the road I think "I wonder if that truck leaks too and if so is the owner aware of it?".

I really love my truck but the fact that this issue is still ongoing is completely pathetic.

Sad to think as long as I own this truck and it has a slider every time it rains I will have to check for leaks.

Sent from my Pixel 3a XL using Tapatalk

Ratchetarms · December 16, 2020

DOES anybody with a rear slider have one that hasn't leaked from the factory?

BlaineBug · December 16, 2020

The windshield in my 2019 Yukon also leaked near the top passenger side headliner. The dealer had a glass company come and they said that the factory urethane was applied improperly. Then after that, the rain sensor for the windshield wipers didn't work. But that too was then replaced under warranty.

Jrodpic · December 16, 2020

Update after sealing the top spoiler gap:

Got some rain this weekend. Truck was out for a few hours. No leak.

Will continue to monitor and report back.

JohnH4260 · December 16, 2020

19 minutes ago, Jrodpic said:

Update after sealing the top spoiler gap:

Got some rain this weekend. Truck was out for a few hours. No leak.

Will continue to monitor and report back.

If I buy a 2021 Denali, I’ll probably just seal the top spoiler gap myself using the Kent High-Tech Seam Sealer in Clear, part no. P10200 (5 oz.), as recommended in the GM TSB from January 2020.

https://static.nhtsa.gov/odi/tsbs/2020/MC-10171889-9999.pdf

Edited December 16, 2020 by JohnH4260

TeamSaris · December 16, 2020

Oof. Glad I found this thread. I kinda don't care about having the slider, but I like the truck. Tough one.

Without reading through the entire 179 pages, its confirmed this is still an issue on 2021s correct?

Edited December 16, 2020 by TeamSaris

Mike_F · December 16, 2020

Quote

Without reading through the entire 179 pages, its confirmed this is still an issue on 2021s correct?

Someone mentioned a few pages back about a new style window frame, but time has not proven it to be a solution.

Rumor has it that GM has now deemed the T1 platform leakage problem to indeed be in the "rocket science" category and have requested help from NASA and JPL.

JWOutdoors29 · December 16, 2020

Just got the call from the dealership that GM is sending a replacement window to be installed by an independent glass company. Should be done this afternoon or tomorrow. I will post which style window it is when I pick it up. My confidence isn't high that this will resolve the issue for good, but still keeping my fingers crossed.

American Cobra · December 16, 2020

2021 Trailboss, build date of 10/20, confirmed leaking.

hihosilverado · December 16, 2020

It is interesting to see some of the brand new trucks leaking. How are the frames cracking that fast?

Steve-2019 · December 16, 2020

Because the stupid use of plastic! Back not that long ago they made of metal. Go figure....

Mudcon · December 16, 2020

I just had the latest part number glass put in mine yesterday. The glass has went through 3 part number changes. Took a month and a half for it to come in. So we will see what happens.

jessebkr87 · December 16, 2020

13 minutes ago, Mudcon said:

I just had the latest part number glass put in mine yesterday. The glass has went through 3 part number changes. Took a month and a half for it to come in. So we will see what happens.

Would you be able to post the part number just to confirm which the latest is? I read through a bunch of posts and between the different part numbers and the change in the style of plastic I couldn't decipher which was actually the latest.