When the C7 Coupe's Windshield is replaced, is it specified in the GM workshop manual to replace the old Windshield Header Weatherstrip Seal 84367842 (#4) with a new one?
Or just recommended to replace?

 

Can't speak to what the manual requirements are, but a general maintenance practice is to replace any gasket or seal as the old gasket/seal may not mold well enough to the new and old parts. The new seal is more "malleable" to the parts being reassembled, and in that situation I'd replace it since not doing so could lead to leaks or squeaks...

 

C7 does not use a traditional windshield gasket on C7s they use a urethane seal bonder. The old urethane bonder is completely removed and the new urethane seal is applied. I know this for a fact as (unfortunately) I’ve had my windshield replaced twice due to cracks from rocks.

Side note, there is a rubber seal (gasket) along the very top but it’s the gasket for the removal top and it has nothing to do with the windshield so it’s not replaced.

You Tube

 

My Windshield was replaced under warranty (Delamination) and I have a Leak - the Dealer and their Glass Subcontractor have looked at it twice and say there is nothing they will further do to remedy the problem. Other posts here have opined that the Weather Stripping Seal Gasket is easily damaged during removal / replacement, and should have been replaced with a new one. I did not see the P/N for it listed in the Work Order or Receipt

The Weatherstrip Rubber Seal/Gasket covers the Top and A Pillars - The leak is inside the car that starts at the top of the inside A Pillar Trim. The Windshield sealing itself seems to be Good. It is the Weatherstrip Rubber Seal/Gasket that seems to be the culprit.

I am trying to build a case that the Weatherstrip Rubber Seal/Gasket ( P/N 84367842 ) should have been replaced and would like to know if the GM Service Manual specifies this as SOP when the Windshield is replaced

 

Can you share a link to any of the posts that opined about also replacing the Seal Gasket because I have read every thread related to windshield replaces/leaks and don’t recall reading the seal gasket as the cause of a leak after windshield replacement. In addition, when I was having my first windshield replaced I asked about top transport gasket and both the dealer and the windshield shop both said they have not had any issues with that gasket. There are two upper door gaskets, one on each side as shown in the video I provided, that are removed in order to remove the outer a-pillar trim. Did the deal or the glass company inspect those? You can inspect them by simply removing the coupe of screws that secure the a-pillar trim.

It’s very easy to inspect the top transport gasket along the top of the windshield for leaks. Simply remove the top and inspect it for rips, tears or a broken seal. There is another possible answer if it the windshield itself is where the leak is coming from. As the gentleman in the video states it critical that all the old adhesive be removed because that could cause a void in sealing the windshield. Of course, if your windshield guy didn’t apply the GM approved urethane in the specified width and depth it would not seal properly resulting in a leak/leaks.

Can you post picture(s) or video of where you are seeing a leak or window getting into the car?

 

Are you saying there is a water leak and the dealer is refusing to fix it ?

 

You may also look into finding someone with an infrared thermographer. They are used to find moisture accumulation, condensation, infiltration, and leakage in walls and windows and may be able to detect where you leak is coming from.

 

Looks as if the OP has ongoing water leak problems after windshield installation.

https://www.corvetteforum.com/forums...post1598517308

https://www.corvetteforum.com/forums...post1599413125

Best would be to purchase the weatherstrip for $185.00 and take it to a reputable shop/glass installation place and have it installed.
Unfastening and fastening the weatherstrip numerous times has likely caused damage to it. Also if there are any clips that hold the weatherstrip in place, I would get new ones.

 

This is the direction I'm heading, but it seems as tho' the header gasket should have been replaced as part of the windshield replacement

 

Have you looked into a product like clearplex?

I had that installed on my 19 when picked up (2 weeks after it was built). Like a sacrificial skin that can be peeled and replaced for about 400.


I amazed how clear it is. Youd never know it was there. And it blocks 99% of the UV rays into car.
had it done with my clear bra and 60% ceramic tint (Suntek) install.

Much less intrusive than having the windshield torn out. I have free glass replacement but f those complications. Money well spent imo.

 

I've read through a lot of different forum posts, some here, some on other sites, that it would be difficult to find the ones that referenced this - the opinion was that removal and re-installation of the gaskets may lead to a tear if the Tech isn't careful - that seems reasonable. I am trying to ascertain if a new Header Trim Gasket is supposed to be used per the GM Repair Manual when the windshield is replaced.

The leak is not the windshield sealing per se; the leak seems to start along the top edge header gasket (removable top / windshield interface), starting at or migrating to the top corner of the Passenger A Pillar and down along the door frame into the footwell, There is no visible trail of water. The inside A Pillar trim becomes wet from top to bottom, the leak flowing down between the inner and outer A Pillar trim along the (windshield) frame, downwards along the front of the inside door frame and into the footwell, starting at the front corner/radius of the door jamb

I was searching online sellers of the header gasket, finding $180ish for the part, but tacking on $200 - $700 for shipping (wtf?!)

 

Add to your cart, check out and type in your Zip and shipping would be $10-$15

https://www.gmpartsgiant.com/parts/g...-84367842.html

 

I need to get my windshield replaced under warranty stress crack on the inside of windshield

 

Interestingly, I had a stress crack and delamination - the warranty repair was authorized for the de-lam, but not the stress crack.

 

!Munches Grasses! Senor
$15.21 shipping - but my (business) address shows to have a error, lol

 

My 2019 is just weeks old. I've come to realize, the windshield is a FREAKIN rock magnet!! I'm pretty sure it's just a matter of time. Was it an easy issue overall? Did you stay with GM OEM? If not, was the replacement just as good with HUD and all. How much? Lotta questions I know, but a general idea of what to expect and avoid?
Thanks!

 

Sound like I need to back-track, restate my case and complain about a leaking header seal

 

I read a bit on that shield. It seems like it does require some care. I've read, the wipers can and probably will scratch it over time. I've definitely thought
about it. Just don't know about it.

 

i had to fight hard to get it they kept saying it was from a stone chip! not a mark on the outside layer of glass cleary on the inside

 

I too wonder if it would get damaged at about the same rate as the stock windshield, just in different ways.
The product might be better, worse, or a wash.

We had our C6 windshield replaced at about 95k miles due to the thousands of tiny chips that caught glare when driving into the sun, don't plan to wait that long on our C7. Had our C5 w/s replaced at about 30k miles because of a scratch. Our Comprehensive insurance (State Farm, Illinois) will replace the w/s just by me asking, 0 deductible, and no premium increase.