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Rear Window Leak on 2020 3500HD Denali

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ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
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My spoiler bolts are scheduled to get replaced next week. Perhaps some silicone or FlexSeal will work for the DIY owners?

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Pate Services
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Didn't notice any leaks in the past few rains but it poured today and it leaked in the same spot. Dealer is now ordering a new rear window. 

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So today was the day my truck went in to get the second replacement window installed. They informed me they found a gap in the top bead of sealant that was from the last install. Rather than replace t

Stand By
Stand By

There are two issues. Make sure they take care of both. One is the window frame cracking. The other is the bolts for mounting the spoiler not sealing right.

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted

The spoiler bolts were replaced a couple weeks ago. It finally rained substantially, and the leak is still there. I called the dealer and let them know. They are going to see what GM says and let me know. This getting old, very quickly. Seems like GM really doesn't care and is just half-assing repairs and approvals just to get by. A true fix would be far more professional and respected.

sdelam Enthusiast

sdelam

Posted
Posted
11 hours ago, greatmizzou said:

Is the leak real obvious?  I honestly havent even looked.  ?

Mine wasn't super obvious. Only noticed it because we were driving in hard rain and I had the kids feel the rear window to see if it was wet on the inside. The headliner would be wet during the rain but dried really fast and the staining wasn't noticeable unless you really looked for it.  

 

edgexcsp Enthusiast

edgexcsp

Posted
Posted

I really love the rear slider in my current but I did not order one in my 2121, and this thread is most of the reason why.  The price of the package that includes the rear slider is another, as I was trying to keep to a pretty strict budget w/ my build.  I knew that I would be beyond frustrating if I got a leaky window in a $50,000 truck...

doozer78 Enthusiast

doozer78

Posted
Posted
I really love the rear slider in my current but I did not order one in my 2121, and this thread is most of the reason why.  The price of the package that includes the rear slider is another, as I was trying to keep to a pretty strict budget w/ my build.  I knew that I would be beyond frustrating if I got a leaky window in a $50,000 truck...
The leak isn't because of the slider

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doozer78 Enthusiast

doozer78

Posted
Posted

Supposedly it's the bolts for rear roof spoiler

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edgexcsp Enthusiast

edgexcsp

Posted
Posted
On 9/10/2020 at 11:34 AM, doozer78 said:

The leak isn't because of the slider

Sent from my SM-A705U using Tapatalk
 

Well that's a little bit disappointing but nixing the rear slider saved about $1200 on the price of the truck...

Stand By Enthusiast

Stand By

Posted
Posted

Both the spoiler bolts and frame of the rear slider have been culprits. I use to be disappointed I didn't have a slider installed. Not so much now. Still watching for a spoiler leak to show up. 

shadow gray 2020 hd Enthusiast

shadow gray 2020 hd

Posted
Posted

Before I washed the truck last week, I noticed two streaks on the back glass, one on each side in about the same place on each side.  They were gone after washing, so I figured they were on the outside.  Going to have to check into this with ours.  Build date for our truck was 8/20, hope the problem was fixed before our truck was built, but would not surprise me much if not.   

 

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted (edited)

There are 2 possible causes for the leak. One is the window frame cracks, the other is the spoiler bolts. Sometimes the new spoiler bolts stop the leak, other times the TSB to seal the top of the window frame stops it. In some cases, the window needs replacing with the updated frame. I've not heard of anyone who had the window replaced, spoiler and bolts replaced, that still has the leak. Not yet, anyway.

 

Seems the spy shots of the 2022 1500s still show a spoiler. Perhaps they've got it figured out finally? I wouldn't hold my breath, though.

Edited by ShotgunZ71
Pate Services Enthusiast

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Got the truck back with new window installed. Leaks worse than ever and now from the passenger side. Goes back to dealership Monday. This is the last repair attempt before I ask them to buy me out or lemon law it. 

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