Rear window leak

[Steve-2019]

22 minutes ago, Big_Kahuna said:

so get about 4 tubes and flood to top of the glass wit it and hope for the best.

 

Yeah, then you get to keep & enjoy your truck! 

[GN2018]

If I ever have a leak, I’m going to pay someone to do the repair just as described in the DIY repair thread (a pinned thread in this forum).  I’m not up for pulling the headliner and all that but there are plenty of good mechanics who wouldn’t flinch at that repair.  Reseal everything under the spoiler and reseal the window frame.  Should be good to go after that.

[DHBWA]

11 hours ago, GN2018 said:

If I ever have a leak, I’m going to pay someone to do the repair just as described in the DIY repair thread (a pinned thread in this forum).  I’m not up for pulling the headliner and all that but there are plenty of good mechanics who wouldn’t flinch at that repair.  Reseal everything under the spoiler and reseal the window frame.  Should be good to go after that.

Exactly. It’s not as bad as it sounds….. especially the second one.

[gahunter]

Hello, new to this forum and unfortunately also new member to the rear window leak club on my 2020 Silverado trail boss for which I am the original owner.  Leak started (or first noticed) December 19 after trip trough the same car wash I've been using for 3 years.  No signs of wet headliner.  Truck is kept in garage, though it was parked outside after it had rained and temp dropped to the lower 20's. I suspect the plastic frame cracked after being wet and freezing.   I've read through majority of this thread over the past week, as well as the other thread DIY sliding window leak permanent repair started by Leevon.  Tons of great info on these threads.  Obviously truck is out of warranty and I plan to fix this myself over the holiday weekend.  Few questions before I get started. 1) What is the torque specs for reinstalling the nuts and bolts on the spoiler?  I assume it isn't a lot. TSB 18-NA-383 doesn't mention it and referrers to a process in "SI", whatever that is.  I recall reading somewhere in here that some spoilers were damaged by dealerships due to over tightening.  2) For those who sealed the window themselves early on, how well has the repair held up? 3) Any reoccurring leaks?  Thanks.

[AJMBLAZER]

My window is leak free so far. I never took the spoiler off mine though. Just tried to prevent the water from getting to the spoiler mounting points. 

[DHBWA]

Leak free for a year on two. I did the whole job. 

[SilverBlahdo]

Mine just started leaking again after 2 full replacements…

[xranger90]

43 minutes ago, SilverBlahdo said:

Mine just started leaking again after 2 full replacements…

Who did the replacements?

[SilverBlahdo]

Dealership. Think im within part warranty since the last replacement so im taking it in one last time and ill try to get them to do the extra caulking. Anyone know the TSB offhand so i dont dig through all the pages?

[DHBWA]

I sealed both our 2019’s almost 2 years ago and so far they are leak free….Both leaked prior and the GMC had a fairly significant crack in the frame looking from inside…

Been raining quite a bit and been checking and all good…

[Jglew82]

Did my reseal a couple weeks ago. Several inches of heavy rain yesterday and inside is dry as a bone. 

Edited January 2, 2025 by Jglew82
Words/spelling

[Josh_166]

New member and have the same problem with my 2019 high country with the rear slider, truck has 71k miles and its the first time my head liner has been wet. I noticed water marks on my rear window a couple times and on my rear seat but never thought anything of it since I fish in the rain lot and figured it was from opening my door in the rain to grab things out of my truck. Yesterday we got about a half inch of rain and I noticed my headliner was soaked. 

 

Read through most of the 235 pages and figured I'd give it a shot so bought most of what everyone was doing so I can fix it to.orrow since I'm drying everything out. One thing I noticed was my gap between my cab and spoiler isn't even, if fact there's a spot where it's so tight it chipped the paint off. Anyone else have this? Looking at the pictures it seems there's a pretty decent gap there for most people. 

[AJMBLAZER]

Mine was like that. One member on here had enough of a gap that he used some weather seal from Lowes. Mine was so tight it wouldn’t even get close to fitting.

 

I ended up going function over form and slathered some clear heavy duty sealant I had on that gap. You couldn’t see it unless you were standing in the bed anyway.

 

That and the windshield sealant around the window and my leaks were gone for the last several years I owned mine. 

Edited April 26, 2025 by AJMBLAZER

[Josh_166]

Ya I saw that so I bought some but looks like I may be returning it unless I use it in the gap between the lower spoiler and rear window. I laid a nice bead between the cab and upper spoiler then wrapped it around the sides of the spoiler as a just in case. Can't see it unless you're looking for it. Ended up buying the permanent 81730 to fill it. The test will be Monday so guess I'll find out how well I did lol. We're in a level 4 for severe weather so there's a chance I may end up with a new truck anyway lol. Definitely love this truck and just got it where I want it so it would be a shame to have to get rid of it.

Edited April 26, 2025 by Josh_166
Added pictures

[GN2018]

I would look at the “DIY sliding window leak permanent repair.” post in this forum.  It’s a sticky.  I don’t see myself as capable of doing that repair, but if my Denali starts to leak, I’m going to find someone to do that repair as I believe it is the best way to ensure that the leak is fixed properly and gives the best chance at it being for good.