Rear window leak

Cpl_Punishment · November 14, 2020

23 minutes ago, Duramaxsky said:

I have been checking mine every rain. Everything from mist to heavy rain. No leaks. I have the longer cab. It seems these are all the shorter crew cab. Is that correct? Maybe a difference in how they flex?

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167 pages of leaks and you think they've all been double cabs so far?

10 minutes ago, Blue5.3l said:

If you switched to a solid window from a slider is it still a possibility to have rear defrost? Safelite shows it would be around $400 to have a tinted solid window with defrost installed. I would imagine all would be needed is to pull the fuse for the slider function to not work.

Lower trims are available with a fixed rear window and a defroster.

Jav_eee · November 14, 2020

I have been checking mine every rain. Everything from mist to heavy rain. No leaks. I have the longer cab. It seems these are all the shorter crew cab. Is that correct? Maybe a difference in how they flex?

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Which is the “longer cab” over the crew cab?

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paui4m · November 14, 2020

26 minutes ago, Blue5.3l said:

If you switched to a solid window from a slider is it still a possibility to have rear defrost? Safelite shows it would be around $400 to have a tinted solid window with defrost installed. I would imagine all would be needed is to pull the fuse for the slider function to not work.

I too researched this option with Safelite and wanted to confirm this as well.

The only thing I am not sure about is the spoiler. The dealer said the bolts that hold the spoiler on are one-time use. they have some type of gasket or sealer on them and can't be re-used. It took a week for them to get these in from GM. I am wondering if a place like Safelite would have those bolts or similar challenges.

Duramaxsky · November 14, 2020

I saw it said that was the case somewhere else. I can't remember where. That's why I am asking here. But i don't think mine leaks yet. It's got about 3000 miles about half towing a 30 foot travel trailer.

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SilveradoRST · November 14, 2020

41 minutes ago, paui4m said:

I too researched this option with Safelite and wanted to confirm this as well.

The only thing I am not sure about is the spoiler. The dealer said the bolts that hold the spoiler on are one-time use. they have some type of gasket or sealer on them and can't be re-used. It took a week for them to get these in from GM. I am wondering if a place like Safelite would have those bolts or similar challenges.

Well, I'd say I don't agree with the dealer. It is true the bolts have a new part number and they are now black as oppose to the grey metal color. These new bolts go on the 4 corners of the spoiler.

It may be that these bolts are one time use, I used them again and they weren't the cause of my leak. But I will say it is the nuts that meet the 8 other bolts around the middle section of the spoiler are more likely one time use. The white gasket or sealer is on the nut, not on the bolt. When I removed the original nuts, the white gasket was completely dried out and fell apart.

In fact, none of the bolts have a gasket. Only the nut side does.

I know. Because I took the headliner down, water tested to find the root cause of my leak, removed the spoiler, replaced the nuts with the gaskets, all 8 of them.

Edited November 15, 2020 by SilveradoRST

paui4m · November 14, 2020

Thanks for the info, Silverado RST!

Duramaxsky · November 15, 2020

Which is the “longer cab” over the crew cab?

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Ok I was mistaken. I thought the double cab was the bigger one but it looks like the crew cab is. And that's what I have. For some reason I thought what I have is called the double cab. Because it's the bigger one.

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Blue5.3l · November 15, 2020

16 hours ago, paui4m said:

I too researched this option with Safelite and wanted to confirm this as well.

The only thing I am not sure about is the spoiler. The dealer said the bolts that hold the spoiler on are one-time use. they have some type of gasket or sealer on them and can't be re-used. It took a week for them to get these in from GM. I am wondering if a place like Safelite would have those bolts or similar challenges.

How does the rear defrost get power? Is there tow separate harnesses? One for the slider and another for the rear defrost? Spoiler appears to be the same regardless of which window you have.

SilveradoRST · November 15, 2020

2 hours ago, Blue5.3l said:

How does the rear defrost get power? Is there tow separate harnesses? One for the slider and another for the rear defrost? Spoiler appears to be the same regardless of which window you have.

Defroster has 4 connectors (it seems). Two in the middle of each side and two smaller ones on the bottom of each side. Took a pic of one side only, top and bottom. The slider has one black with white swirl line coming out of the motor assembly at the bottom behind the driver side rear seat. I don't know if you have to remove the rear bench to get to the connector as I was not able to follow the line down.

Edited November 15, 2020 by SilveradoRST

Jrodpic · November 15, 2020

Update:

Wife took the truck out of town and it sat out in the rain. I told her to check and look for a leak, she forgot...... I checked it out after she got home. No evidence of water getting in the cab. I will park the truck out in the next rain and check again.

Edited November 15, 2020 by Jrodpic

Dali555 · November 18, 2020

And now we shall see. After talking with GMC through email and on the phone and setting up with them I finally took my AT4 in to have the leak "looked at". Not great feeling in the gut right now... talked with the service manager and he said he never heard of them cracking and that it's usually the third brake light... oh boy... told him I was very nervous about this and told him some of the horror stories from this thread.... I'll update as soon as I hear.... UGH!

Dali555 · November 19, 2020

10 hours ago, Dali555 said:

And now we shall see. After talking with GMC through email and on the phone and setting up with them I finally took my AT4 in to have the leak "looked at". Not great feeling in the gut right now... talked with the service manager and he said he never heard of them cracking and that it's usually the third brake light... oh boy... told him I was very nervous about this and told him some of the horror stories from this thread.... I'll update as soon as I hear.... UGH!

Well, just picked it up and they said my seal is leaking. They have to replace the entire window and shocker!, it’s on back order. No clue how long it will take to get in so I picked up my truck and will bring it back when it does. They also lightly scratched the plastic on the pillar so I brought out the service guy and showed him and he said that’s unacceptable so he made a note and signed it that it gets taken care of when they replace the window.... this is gonna suck!

UGADawgs · November 19, 2020

1 hour ago, Dali555 said:

Well, just picked it up and they said my seal is leaking. They have to replace the entire window and shocker!, it’s on back order. No clue how long it will take to get in so I picked up my truck and will bring it back when it does. They also lightly scratched the plastic on the pillar so I brought out the service guy and showed him and he said that’s unacceptable so he made a note and signed it that it gets taken care of when they replace the window.... this is gonna suck!

They lied to you three times. They do know about the issue, they know it isn't the spoiler, and then they told you it was the seal when in fact the frame is cracked like all the others.

OnTheReel · November 19, 2020

I’m surprised they are even replacing the window. Thought they had to dick you around with the caulk-job first.

ShotgunZ71 · November 19, 2020

Mine went to the dealer 3 times for a fix. They tried all the steps GM recommended to no avail. I got some seam sealant and applied it to the window frame and bolt holes. The leak is reduced, but not entirely gone in heavy rains when stationary. My next plan is to apply some all across the body seam that is located beneath the spoiler but above the bolt holes. We will see if that helps.