Rear window leak

Duramaxsky · October 22, 2020

It rained all day here. Sometimes really hard rain. I looked it over real careful and it's dry. I hope it won't leak. As for the headliner I think either the windshield or the rear window has to come out to get it out of the truck. At least that was the case on my 03 Duramax. Well not mine as it's an extended cab but if it was a crew cab it would.

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RadBrad · October 22, 2020

2 hours ago, paui4m said:

I agree regarding having mine tore apart.

So, what are your next steps?

Honestly I don't know really.

Blade8971 · October 22, 2020

My 2020 TB went to the dealer a few days ago for the leak issue on the rear window - got it back yesterday.

It rained last night through to this morning...checked the rear seats and window....so far no leaks.

My dealer arranged to have an auto glass company remove the window and reinstall it as they determined the original seal was defective.

econometrics · October 26, 2020

Well... winter is arriving in North Texas today/tomorrow. Cold, windy, and slow and steady rain. Had to put a new dry towel behind my rear seat to get ready for all the leaking.

JWOutdoors29 · October 26, 2020

Steady, all day rain here too. My window will be getting it's first test since being repaired last week.

mrskiff · October 26, 2020

Well my second reseal failed so back to the dealer for a 3rd time i go. Love the truck but this is getting old quickly

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Jrodpic · October 27, 2020

On 10/20/2020 at 10:53 AM, Jrodpic said:

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

Looking at the pictures from the service bulletin I am convinced it is caused by water running down the top gap of the spoiler. It is either getting in the holes or cracks on top of the window. I am willing to bet that if a gasket/weather stripping was put in to prevent water from getting in that gap it would fix the problem. Someone with a leak should try to measure the gap and use something like this. That’s one of the first things I am going to do once ours if finally delivered.

1/16”? 1/8”? 1/4”?

https://www.zoro.com/e-james-rubber-cord-neoprene-18-in-dia-10-ft-csneo-18-10/i/G7615781/?recommended=true

Got the truck. Measured the gap. 1/4”. I ordered a couple different rubber cords to try to seal it. Will report back how it fits.

Edited October 27, 2020 by Jrodpic

UGADawgs · October 27, 2020

8 hours ago, Jrodpic said:

Got the truck. Measured the gap. 1/4”. I ordered a couple different rubber cords to try to seal it. Will report back how it fits.

I like this idea. Let us know how it goes.

Z71RAD88 · October 27, 2020

58 minutes ago, UGADawgs said:

I like this idea. Let us know how it goes.

Me too.

SilveradoRST · October 27, 2020

Anyone have the official spoiler removal instructions?

Loner88 · October 27, 2020

When they did mine last week, they ordered new nuts for the spoiler. Said they were some kind of updated ones to help the leak issue.

bamorris2 · October 28, 2020

2 hours ago, SilveradoRST said:

Anyone have the official spoiler removal instructions?

Roof Rear Spoiler Replacement.pdf Headlining Trim Panel Replacement.pdf

paui4m · October 28, 2020

Mine is getting worse quickly. It was barely raining here today, and it was a pretty steady drip. The towel was surprisingly wet .

With over an inch in the forecast, and given it won't fit in the garage, I reluctantly called a dealer today and it's going in tomorrow morning.

More to come.

OnTheReel · October 28, 2020

7 minutes ago, paui4m said:

Mine is getting worse quickly. It was barely raining here today, and it was a pretty steady drip. The towel was surprisingly wet .

With over an inch in the forecast, and given it won't fit in the garage, I reluctantly called a dealer today and it's going in tomorrow morning.

More to come.

“Barely raining” is usually the worst for some reason.