Poll: Does your truck have the rear window leak?

[amyredchevy]

Yes. Just discovered it

[Shaunmzs]

Really wasn't hoping to revisit this thread.  I have a 2020 that I bought brand new, well wouldn't you know it after ~ 5years and 52,000 miles, discovered mine is leaking this weekend.  Couldn't have happened under warranty when I was keeping a closer eye on it after discovering this thread 5 years ago...

 

My son was sitting in the back and noticed the headliner is stained from past water leaks.  After looking closer, there are cracks all along the plastic trim piece in 3-4 different locations with water stains where it has been dripping down...

 

I was contemplating taking it back to the dealer and having a new window installed, but sounds like I should try the SEM leveling sealer and 3M strip caulk fix mentioned in this forum by Leevons DIY post.  Since they still haven't changed the design.

 

Shocked, not shocked to see this is still an issue with the newer trucks. 

[shakerjoe]

My ‘19 HC presently at the dealer the last 2 weeks, stated needed new rear window which just got in…quoted almost $3K for the job…new hip replacement so I’m out doing the job myself…GM offered $270 off when I complained even with the TSB…I’m steaming, looking at end of week possibly to getting truck back. This is wrong…no loaner either.

Edited March 24 by shakerjoe

[Mike Duhaime]

Yes, but it's the vent that popped out!!

Look at bottom of rear window, between box and below rear window. Chances are,  a vent popped out! Replacing this is not easy, as the box must be unbolted and pulled back far enough to insert this @#$% thing. Thanks GM, for another useless feature that costs us time and money. Water pouring in FFS

[Silver Yeti]

New member here, I have a 2021 Chevy Silverado 1500 RST Double Cab with the 5.3L L84 and the 8 speed 8L90 Transmission which I bought almost 2 months ago, back on April 13th 2026 as the 2nd owner, the truck had 35,875 miles on the clock.

 

I was aware of this rear window water leak problem and I carefully checked the headliner and the rear seats in this truck for any water stains, when I initially went & looked at it and I didn't see any water stains present.

 

Sure enough, the first heavy rain I was out in, I saw some water drops on the top of the rear seats, but the headliner remained dry.

 

It wasn't a massive leak, but it definitely need to be fixed, so I wound up finding 2 YouTube Videos, which were very helpful in showing me how to do the job.

 

One was a video of the actual repair itself, which invloves completely filling the outside top seam of the rear windhield with ATV/Silicone and the other video was a how-to, on dropping the headliner.

 

After I noticed the leak, which was on a Thursday, I took that very day (Friday off) and tackled the repair job.

 

Looking at the cab's rear window, I saw nothing obvious that was wrong, so my guess is I had some small hairline crack somewhere in the plastic trim that goes around the cab's rear window, but nothing plainly visible, like the guy in the YouTube video had. Looking really closely, I could see some old water drip-streaks coming down the inside of the rear cab window, but you had to look really hard to see them, but again, no obvious cracks in the plastic trim around the rear cab window were visible.

 

It took me about 9 hrs from start to finish, but I was really taking my time and being methodical about it, trying to ensure that I didn't break anything while tearing the interior apart so I could drop the headliner to get at the nuts & bolts that hold the third brake light assembly to the rear of the cab.

 

All things considered, the job went pretty well, albeit time-consuming and tedious.

 

But it fixed the leak, so it was time well spent and I fixed that problem in very short order and don't expect that it will EVER be a problem again.

 

Somebody that's more familiar with how to drop a headliner and who's more mechanically inclined, could easily shave 2 or 3 hours off the amount of time it takes to complete this job.

 

Like I said, I was really trying to not break anything while taking the interior apart.

 

These are the 2 videos I used for guidance;

 

While the video of the repair itself was useful, it didn't go into any detail about how to drop the headliner, so the 2nd video was really key, in getting the job done.

 

Hopefully, this will help some folks.

 

 

 

 

Edited June 16 by Silver Yeti

[ShotgunZ71]

Glad you had success with it. I did as well, but about 5-6 months later it returned. Tried again, same result. This was after the dealer made several attempts and never even got it to slow down.