annoying drip from top of windshield

[74_Coach]

I thought I replied to this but it sure is not showing up right now.

I talked to Paul owner of PDK (Preferred Glass). He said in 35 years and over 200+ GMCs he can remember doing three new gaskets when they replaced the windshields. I asked about sealing the gasket to the body when installing it prior to the windshields being installed. He said the way they seal the windshields to the coach body that the added sealant you are talking about is unnecessary. He would not do it. He said if you choose to do it, the only possible problem he sees is if they take too much time between installing the gasket and installing the glass and that time allowed the sealant to set up or even partially set up. Then there is a chance that the windshield could be broken during install or later while driving down the road. He said to only seal one side and immediately install the windshield. Then seal the gasket on the other side and immediately install the second one.

Again he said he would not do it. Just seal them like you see in the video and you should be OK.

Ken B.

Thank you Ken. Well, I will just mothball the gasket and find an installation center near me that works with Coach Glass.

Update: I discovered the following image in the Dealer Service Technical Bulletin number 75-TM-10 A Water Leak Diagnosis and Correction.

 

[Ken B]

ED,
I was not trying to convince you or anyone not to replace the gasket. Especially if you have already pulled both windshields. I was / am trying to supply you with information to make an educated decision on your own. I only know first hand what these guys at Preferred Glass have been successful at doing. I have known them for over 25 years.

There is at least one shop that I know of that will not replace the windshields without replacing the gasket. I do not know what they do if you need only one side replaced. I know of two GMC places that only take orders and ship windshields to you. They leave it up to you to find someone to do the install work locally. I also know of a few GMCers that have done the work successfully on their own.

So good luck on your project and explore all possibilities before tackling the job.

Ken B

 

[GlenC]

This is probably a good time to tell people that If you are going to remove the windshields, when the windshields are out, take the time to remove all of screws holding the dash to the body that reside up at the windshield. They are Philips screws. Remove them, and replace with a SS screw of the same size and place a little white lube on the threads. Then tighten them snug only. Some day if you need to take those screws out, when the windshields are in, backing the screws out at the windshield angle, they will come out quite easy. In addition, while the windshields are out, take the time to clean up the windshield edges and apply some kind of sealer to the edges. Over time, moisture can seep between the gasket and the glass, working its way between the layers of the safety glass creating the fogging effect that we see on older installations. Sealing the edges will delay or prevent this fogging from happening. JWID

This is where I would consider using SS allen head screws. This way you can use a ball end allen to remove when windshield is inplace.

As for sealing the rubber gasket at the body, I plan to clean mine (a PO put sealant there) and apply Lexel.

 

[boybach]

This is where I would consider using SS allen head screws. This way you can use a ball end allen to remove when windshield is inplace.

As for sealing the rubber gasket at the body, I plan to clean mine (a PO put sealant there) and apply Lexel.

Hey it's your coach but if I were you I'd use a polyurethane and forget silicones, no matter how fancy a brand.

 

[GlenC]

Hey it's your coach but if I were you I'd use a polyurethane and forget silicones, no matter how fancy a brand.

boybach, Lexel is not a silicone product, however I see it's not compatible with rubber.

 

[boybach]

boybach, Lexel is not a silicone product, however I see it's not compatible with rubber.

Noted, thanks. I recommend this for the job, the black version of course. Cheap to buy and sticks like $hit to a blanket.

Skins fairly quickly and cleans up with methyl alcohol.

https://www.rona.ca/en/product/dap-...f-concrete-sealant-300-ml-gray-74816-04915136

Larry

 

[uhiroshi]

Be careful about "peeling back" the gasket. The approach I took was filling the void between the gasket and the roof/cap. I used 3M windshield buytle tape and pushed it in with my fingers then "smoothed" it out. I'm sure they sell it at tube but no one I had was left over from putting the windshield in my kid's Fiero.

hello may i ask how you put buytle ? from inside or outside ?