Super leaky windshield - The 1947 - Present Chevrolet & GMC Truck Message Board Network

red71cheyenne · 10-12-2010, 12:35 PM

Hi guys, its raining in my Blazer! What would you guys recommend to seal it up? I am thinking the glazing compound would be good, but its so gooey. Any other ideas out there? I've heard not to use silicone. Thanks, Jeff.

Lee H · 10-12-2010, 12:48 PM

Find the nearest windshield installer and have them remove and replace it

ChevLoRay · 10-12-2010, 01:43 PM

Are you sure that it is the windshield? Where is the leak? You know it isn't uncommon for the windshield to get the blame when it is the sheet metal.

Jacfourteen · 10-12-2010, 05:08 PM

I'd start with a new gasket.

usmcchevy · 10-12-2010, 08:47 PM

Pull the windshield, inspect windshild frame it might be rusted out. After cleaning and repair, install winshield with new gasket. If you try to seal it up with silicone or whatever you may end up trapping mosture in there and cause it to rust faster.

red71cheyenne · 10-12-2010, 10:06 PM

This is an all newly refurbished windshield frame on the Blazer that I just restored. Its definitely leaking in around the windshield as you can see the water puddling in the gasket!! This is the windshield I had so much trouble getting installed as it wouldn't fit and had to do some grinding on the glass and the frame to get it in there. It has a new gasket, new glass and like I said, the frame is basically new.

Zoomin · 10-12-2010, 10:15 PM

Use self-leveling silicone. Basically it remains liquid long enough to flow to where the leak is, then it solidifies.

red71cheyenne · 10-12-2010, 10:26 PM

Quote:

Originally Posted by Zoomin

Use self-leveling silicone. Basically it remains liquid long enough to flow to where the leak is, then it solidifies.

This is on the glass side right? I'm trying to keep all the silicone off the metal as I've heard it'll cause problems with the paint later on. I was going to use glazing compound on the metal side.

ChevLoRay · 10-12-2010, 10:33 PM

What about the urethane that glass installers use on the late models? I've also seen glass men use some kind of caulking that is injected between the glass and the gasket.

red71cheyenne · 10-12-2010, 10:45 PM

Quote:

Originally Posted by ChevLoRay

What about the urethane that glass installers use on the late models? I've also seen glass men use some kind of caulking that is injected between the glass and the gasket.

May have to stop at Safelite and ask them if they know what you are talking about. Was kind of thinking I might do that anyway as they couldn't get it in there to start with. I'd love to have it not leak at all. It just rains too much here.

Zoomin · 10-12-2010, 10:54 PM

Quote:

Originally Posted by red71cheyenne

This is on the glass side right? I'm trying to keep all the silicone off the metal as I've heard it'll cause problems with the paint later on. I was going to use glazing compound on the metal side.

I pull the rubber gasket back and it goes between the gasket and the glass, but some probably gets on the metal that's not seen.

Zeke · 10-13-2010, 06:08 AM

You shouldn't have had to grind the glass to fit as it is in front of the frame when installed. One tip I got from the service manual is to carefully lay the glass on the frame and 'adjust' frame to fit contour of the windshield. It also says to apply sealer on the bottom and upper corners.

red71cheyenne · 10-13-2010, 11:01 PM

Quote:

Originally Posted by Zeke

You shouldn't have had to grind the glass to fit as it is in front of the frame when installed. One tip I got from the service manual is to carefully lay the glass on the frame and 'adjust' frame to fit contour of the windshield. It also says to apply sealer on the bottom and upper corners.

When I split the frame in half to sandblast and repair rust, I think I shrunk the whole thing a bit when I put it back together. The opening wasn't as big as it originally was and thats why the glass guys ground it down a little. They eventually gave up trying to get it in and I also had to do some opening of the frame itself. Thats all probably part of why it is leaking.

Zeke · 10-14-2010, 04:19 AM

I would try some flowable silicone windshield and glass sealer or even black rtv. Since the rubber is new it is still flexable, use a dull putty knife and lift the edge of the rubber squirt some in and work your way around. Use a razor blade to clean off any that squeezed out after it cures. Might be better to remove the windshield and dry and clean the channel put sealer all around the glass and reinstall.

If your Blazer is already painted silicone won't be a problem.

red71cheyenne · 10-14-2010, 01:35 PM

Quote:

Originally Posted by Zeke

I would try some flowable silicone windshield and glass sealer or even black rtv. Since the rubber is new it is still flexable, use a dull putty knife and lift the edge of the rubber squirt some in and work your way around. Use a razor blade to clean off any that squeezed out after it cures. Might be better to remove the windshield and dry and clean the channel put sealer all around the glass and reinstall.

If your Blazer is already painted silicone won't be a problem.

Thanks, I had thought about pulling it, but worried the silicone would ruin the paint. If its already painted it won't hurt it?

ChevLoRay · 10-14-2010, 05:44 PM

RTV....if it is NOT the automotive variety, will react with the sheet metal. If you don't believe me, take a look at this picture. This is what non-automotive RTV will do.....all because a previous owner was trying to stop a leak. This is before I pulled it out of the trough....which is what you see. When I pulled it out, it was amazing that the front of the firewall stayed attached to the rest of the cowl.

red71cheyenne · 10-14-2010, 05:52 PM

Quote:

Originally Posted by ChevLoRay

RTV....if it is NOT the automotive variety, will react with the sheet metal. If you don't believe me, take a look at this picture. This is what non-automotive RTV will do.....all because a previous owner was trying to stop a leak. This is before I pulled it out of the trough....which is what you see. When I pulled it out, it was amazing that the front of the firewall stayed attached to the rest of the cowl.

Thanks Ray. I'm going to consult the windshield guys at Safelite to see what they can do for me. I know they also guarantee their work, so might be a good way to go.

R.L. · 10-14-2010, 08:12 PM

This thread is useful, I just had new glass installed front and back; the new gaskets don't seal like the old one's did. Theirs places that you could slide a piece of paper between the metal and rubber I know water will get in there. Automotive RTV,self sealing if possable.

Zoomin · 10-14-2010, 09:49 PM

Here's the stuff I was talking about....

red71cheyenne · 10-14-2010, 10:03 PM

Quote:

Originally Posted by Zoomin

Here's the stuff I was talking about....

Thanks! I'll try and find the stuff and go from there.

Zeke · 10-15-2010, 05:19 AM

Ray's right, the wrong stuff will have a very strong smell. I always play it safe when I buy black RTV and make sure it meets GM specs.

69 longhorn · 10-15-2010, 11:56 PM

I worked in glass for 10yrs,.....long enough to cut the windsheild on my old chop top

I you have a leak, I would not mess with silicone....glue it down with ureathane....& dont look back

crazy AL

10-12-2010, 12:35 PM	#1
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Super leaky windshield Hi guys, its raining in my Blazer! What would you guys recommend to seal it up? I am thinking the glazing compound would be good, but its so gooey. Any other ideas out there? I've heard not to use silicone. Thanks, Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-12-2010, 12:48 PM	#2
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Super leaky windshield Find the nearest windshield installer and have them remove and replace it __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

10-12-2010, 01:43 PM	#3
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Super leaky windshield Are you sure that it is the windshield? Where is the leak? You know it isn't uncommon for the windshield to get the blame when it is the sheet metal. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

10-12-2010, 05:08 PM	#4
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Super leaky windshield I'd start with a new gasket. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

10-12-2010, 08:47 PM	#5
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: Super leaky windshield Pull the windshield, inspect windshild frame it might be rusted out. After cleaning and repair, install winshield with new gasket. If you try to seal it up with silicone or whatever you may end up trapping mosture in there and cause it to rust faster. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

10-12-2010, 10:06 PM	#6
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Super leaky windshield This is an all newly refurbished windshield frame on the Blazer that I just restored. Its definitely leaking in around the windshield as you can see the water puddling in the gasket!! This is the windshield I had so much trouble getting installed as it wouldn't fit and had to do some grinding on the glass and the frame to get it in there. It has a new gasket, new glass and like I said, the frame is basically new. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-12-2010, 10:15 PM	#7
Zoomin Man of Mini-Talents Join Date: Sep 2009 Location: Oklahoma City, OK Posts: 4,295	Re: Super leaky windshield Use self-leveling silicone. Basically it remains liquid long enough to flow to where the leak is, then it solidifies. __________________ Steve Project - Ruth 66 Skylark Project - Lola 60 Biscayne Project - Iron Ox 54 GMC 100 Project - Darth 69 Camaro

10-12-2010, 10:33 PM	#9
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Super leaky windshield What about the urethane that glass installers use on the late models? I've also seen glass men use some kind of caulking that is injected between the glass and the gasket. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

10-13-2010, 06:08 AM	#12
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: Super leaky windshield You shouldn't have had to grind the glass to fit as it is in front of the frame when installed. One tip I got from the service manual is to carefully lay the glass on the frame and 'adjust' frame to fit contour of the windshield. It also says to apply sealer on the bottom and upper corners. Attached Images __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

10-14-2010, 04:19 AM	#14
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: Super leaky windshield I would try some flowable silicone windshield and glass sealer or even black rtv. Since the rubber is new it is still flexable, use a dull putty knife and lift the edge of the rubber squirt some in and work your way around. Use a razor blade to clean off any that squeezed out after it cures. Might be better to remove the windshield and dry and clean the channel put sealer all around the glass and reinstall. If your Blazer is already painted silicone won't be a problem. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

10-14-2010, 05:44 PM	#16
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Super leaky windshield RTV....if it is NOT the automotive variety, will react with the sheet metal. If you don't believe me, take a look at this picture. This is what non-automotive RTV will do.....all because a previous owner was trying to stop a leak. This is before I pulled it out of the trough....which is what you see. When I pulled it out, it was amazing that the front of the firewall stayed attached to the rest of the cowl. Attached Images __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 10-14-2010 at 05:46 PM.

10-14-2010, 08:12 PM	#18
R.L. Registered User Join Date: Sep 2008 Location: Mobile, Al. Posts: 687	Re: Super leaky windshield This thread is useful, I just had new glass installed front and back; the new gaskets don't seal like the old one's did. Theirs places that you could slide a piece of paper between the metal and rubber I know water will get in there. Automotive RTV,self sealing if possable.

10-14-2010, 09:49 PM	#19
Zoomin Man of Mini-Talents Join Date: Sep 2009 Location: Oklahoma City, OK Posts: 4,295	Re: Super leaky windshield Here's the stuff I was talking about.... Attached Images __________________ Steve Project - Ruth 66 Skylark Project - Lola 60 Biscayne Project - Iron Ox 54 GMC 100 Project - Darth 69 Camaro

10-15-2010, 05:19 AM	#21
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: Super leaky windshield Ray's right, the wrong stuff will have a very strong smell. I always play it safe when I buy black RTV and make sure it meets GM specs. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

10-15-2010, 11:56 PM	#22
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Re: Super leaky windshield I worked in glass for 10yrs,.....long enough to cut the windsheild on my old chop top I you have a leak, I would not mess with silicone....glue it down with ureathane....& dont look back crazy AL __________________ http://community.webshots.com/user/hotrodhorn



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.