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Rear Window Leak on 2020 3500HD Denali

Pate Services
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Pate Services
Pate Services

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. 

Pate Services
Pate Services

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

Mine still leaks after 3 tries. The TSB, new spoiler and new spoiler bolts. Not real sure what to try next. Thought of calling another dealer to see if they've had any success or possibly just trying to seal it myself. Some weatherstripping and silicone caulk may do some good. The frames may get cracks we can't even see that leak. Disappointing for anyone to have this and GM has no reliable repair.

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted
5 hours ago, Pate Services said:

Dealership says the new replacement window is cracked and leaking same as orginal one. They are ordering a second new window. Total bs quality. 

That's a shame. I wonder how many leak and the owners don't even know? 

shadow gray 2020 hd Enthusiast

shadow gray 2020 hd

Posted
Posted

No doubt that would be a turn off.  Hope they get it straight for you.  Situations like this, would seem gm would be eager to give their customers some compensation for the time involved.  Unfortunately it seems most auto makers have their issues they fail to address in a fair time frame. 

 

Dodge screwed us over on our awd limited durango with a hemi.  Bought it new in 08 with a lifetime powertrain warranty.  Was a recall for the gas filler spout for it pouring gas out when filling about 6 years in.  Made complaints to the servicing dealer several times, and finally they fixed it with the recall.  Last year it developed rust through directly under the filler door.  The only rust anywhere on the vehicle, has been for the most part garage kept and driven in TN where exposure to salted roads is not an issue.  Dodge knows this is an issue that they are to blame for, but they refuse to fix it.  I have seen loads of the same body style with the same rust through from minor to so bad there are large holes.  For that sole reason I took dodge off the table for consideration on our new truck. 

Pate Services Enthusiast

Pate Services

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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 the window as planned to correct the flaw they dropped the headliner and pulled the spoiler. They put a thick bead of sealant along the top just like they did in the first repair attempt. Best part is they ran it though their car wash to leak test it and they crushed my passenger side mirror. Truck now needs a whole new side mirror. Unreal.

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Stand By Enthusiast

Stand By

Posted
Posted

I remember years a go when extended cabs became popular, there were some after market vendors that made power window kits for the rear window. I don't think sliders were available for awhile, just like the 3rd door option in 97, finally. Curious what kind of market there would be right now for a power rear window install to alleviate the leak headaches? 

  • 5 years later...
Omega New Member

Omega

Posted
Posted (edited)

Same issue here in Vancouver Washington.  Service Advisor (SA) says he’s NEVER had a GM truck with this problem before.  I live in a Rain Forest and I’m the first one he’s ever seen with this issue.  WTH?  Guess he was hired this morning.  Does anyone have any TSBs related to leaking rear sliding window and/or top center mounted exterior brakelight? Thanks for everyone’s comments regarding roof and window leaks.  I’m trying to get GM to help pay for this repair which has been reported in places like this for years.  Yeah I know; good luck with that.  Many thanks again from a 41-year Air Force Veteran.

Edited by Omega
Added request for appropriate TSBs for these issues

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