Leaking around windshield - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70' GMC · 12-01-2008, 03:02 PM

Its also leaking under the dash from a big rain we had in NC. Does anyone have pics of this that may have happened to their truck or even some rough truck builds??? Its real bad on the passengers side and it leaks a little on the drivers side under the dash and around the windshield.

Thanks everyone for all your help.

dave2953 · 12-01-2008, 03:06 PM

Mine does the same thing. I was thinking it was a windshield gasket, but when I posted it many members thought there was rot in the area under the gasket. I think they were right. I tried to seal it with clear RTV and it didn't help a bit. Mine only leaked if it rained really hard.

70' GMC · 12-01-2008, 03:42 PM

Quote:

Originally Posted by dave2953

Mine does the same thing. I was thinking it was a windshield gasket, but when I posted it many members thought there was rot in the area under the gasket. I think they were right. I tried to seal it with clear RTV and it didn't help a bit. Mine only leaked if it rained really hard.

it leaks really bad on the passengers side and a decent amount on the drivers side.

Lippyp · 12-01-2008, 04:02 PM

So does mine, I'm going to pull the glass, repair any rust I find and get new rubber. The current one is rock hard and the previous owner has tried to seal it with silicone

Longhorn Man · 12-01-2008, 04:57 PM

While I'm sure it is leaking through the glass gasket, your main leak is probably under the cowl. VERY common for the seam sealer to dry and crack letting lotsa water in. Every truck I've owned had this issue.

oldblue1968chevy · 12-01-2008, 05:17 PM

mine does the same thing..so whats the problem that I should be fixing..

bigguy69 · 12-01-2008, 05:23 PM

i have the same thing going on ialso noticed the window gasket falling down in the corners. i think it is rust?

oldblue1968chevy · 12-01-2008, 05:30 PM

my window gaskets fallin off also lol somebody siliconed it up :S

GOPAPA · 12-01-2008, 07:59 PM

[QUOTE=oldblue1968chevy;3002692]my window gaskets fallin off also lol somebody siliconed it up :S[/QUOTE

Might want to take it to a glass shop and have them put some sealer under the gasket . They have the applier that can do this ..I had this done and solved my problem with out removing the window .. papa

heavy71chevy · 12-01-2008, 09:13 PM

mine leaks like a waterfall during rain...I agree with longhorn man totally about the sealer under the passenger side dash.

pat123 · 12-01-2008, 09:18 PM

is their anyway to tell if the cab is rusted around the window without taking it out?

skchevota · 12-01-2008, 10:14 PM

Mine was leaking where the antena wire goes in the cab under the cowl. I siliconed it up and the leak was fixed, to bad I found it after it wasted my rocker.

**bigsnookmaster** · 12-01-2008, 10:35 PM

Sometimes you can take a cotter pin removal tool and gently lift the rubber from the inside and see if there is any rust in the pinchweld area.If there is, it needs to be fixed. My experience has shown that a new gasket is very helpful to fix the problem if it is the gasket,remember these trucks are 40 or so years old.That rubber gets real hard and shrinks and cracks over time.Good luck.

70' GMC · 12-01-2008, 11:22 PM

is there any faqs for this area and who has the best patch panels and gaskets for the rusty brittle leaky rubber?????

pat123 · 12-03-2008, 12:03 AM

Thanks Bigsnookmaster ill try that

smoked68 · 12-03-2008, 12:29 AM

Mine was doing the same, I was sealing something one day and figured what the hay. With finger and black RTV I mushed and smoothed all the way around. No more leaky and looks good too. I love it when a plan comes togeather.

Woody · 12-03-2008, 08:19 AM

There are a couple seams where the cab was pieced together that the seam sealer dries up and cracks, that always leak. They are located under the Cowl and are about 6 inches in from each side. There also are seams above the windshield at the same locations that are prone to leaking. Using Black RTV in a caulk gun to seal around the windshield gasket (inside and outside) helps as well. But truthfully, this is only temperary and sooner or later you need to pull the windsheild and fix the seams and install a new gasket.

70' GMC · 12-03-2008, 10:04 AM

Quote:

Originally Posted by Woody

There are a couple seams where the cab was pieced together that the seam sealer dries up and cracks, that always leak. They are located under the Cowl and are about 6 inches in from each side. There also are seams above the windshield at the same locations that are prone to leaking. Using Black RTV in a caulk gun to seal around the windshield gasket (inside and outside) helps as well. But truthfully, this is only temperary and sooner or later you need to pull the windsheild and fix the seams and install a new gasket.

how long does this last????

12-01-2008, 03:02 PM	#1
70' GMC HERE.......Somewhere Join Date: Oct 2006 Location: Birmingham AL Posts: 2,488	Leaking around windshield Its also leaking under the dash from a big rain we had in NC. Does anyone have pics of this that may have happened to their truck or even some rough truck builds??? Its real bad on the passengers side and it leaks a little on the drivers side under the dash and around the windshield. Thanks everyone for all your help. __________________ Current rides: 2013 Hyundai elantra gt DD 1995 camaro my first crush lmao Was: 1970 with a 350 4barrel and 288 horses Classics make it possible!

12-01-2008, 03:06 PM	#2
dave2953 Dave's not here, man Join Date: Jun 2004 Location: Winder, Georgia Posts: 2,000	Re: Leaking around windshield Mine does the same thing. I was thinking it was a windshield gasket, but when I posted it many members thought there was rot in the area under the gasket. I think they were right. I tried to seal it with clear RTV and it didn't help a bit. Mine only leaked if it rained really hard. __________________ - 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250

12-01-2008, 04:02 PM	#4
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: Leaking around windshield So does mine, I'm going to pull the glass, repair any rust I find and get new rubber. The current one is rock hard and the previous owner has tried to seal it with silicone __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

12-01-2008, 04:57 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Leaking around windshield While I'm sure it is leaking through the glass gasket, your main leak is probably under the cowl. VERY common for the seam sealer to dry and crack letting lotsa water in. Every truck I've owned had this issue.

12-01-2008, 05:17 PM	#6
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Leaking around windshield mine does the same thing..so whats the problem that I should be fixing.. __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

12-01-2008, 05:23 PM	#7
bigguy69 dazed and confused Join Date: Jul 2008 Location: marion nc Posts: 1,649	Re: Leaking around windshield i have the same thing going on ialso noticed the window gasket falling down in the corners. i think it is rust?

12-01-2008, 05:30 PM	#8
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Leaking around windshield my window gaskets fallin off also lol somebody siliconed it up :S __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

12-01-2008, 07:59 PM	#9
GOPAPA Registered User Join Date: Oct 2007 Location: Nampa Idaho Posts: 7,628	Re: Leaking around windshield [QUOTE=oldblue1968chevy;3002692]my window gaskets fallin off also lol somebody siliconed it up :S[/QUOTE Might want to take it to a glass shop and have them put some sealer under the gasket . They have the applier that can do this ..I had this done and solved my problem with out removing the window .. papa __________________ When you learn a thing a day you store up smart.

12-01-2008, 09:13 PM	#10
heavy71chevy Registered User Join Date: Apr 2007 Location: antreville, south carolina Posts: 873	Re: Leaking around windshield mine leaks like a waterfall during rain...I agree with longhorn man totally about the sealer under the passenger side dash. __________________ "Dixie Destroyer" 71 C10 LWB Fleet Future Blown Prostreet Monster

12-01-2008, 09:18 PM	#11
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: Leaking around windshield is their anyway to tell if the cab is rusted around the window without taking it out?

12-01-2008, 10:14 PM	#12
skchevota Registered User Join Date: Oct 2006 Location: Evans, Colorado Posts: 530	Re: Leaking around windshield Mine was leaking where the antena wire goes in the cab under the cowl. I siliconed it up and the leak was fixed, to bad I found it after it wasted my rocker.

12-01-2008, 10:35 PM	#13
bigsnookmaster Senior Member Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,270	Re: Leaking around windshield Sometimes you can take a cotter pin removal tool and gently lift the rubber from the inside and see if there is any rust in the pinchweld area.If there is, it needs to be fixed. My experience has shown that a new gasket is very helpful to fix the problem if it is the gasket,remember these trucks are 40 or so years old.That rubber gets real hard and shrinks and cracks over time.Good luck. __________________ greg http://community.webshots.com/user/68406Stepside

12-01-2008, 11:22 PM	#14
70' GMC HERE.......Somewhere Join Date: Oct 2006 Location: Birmingham AL Posts: 2,488	Re: Leaking around windshield is there any faqs for this area and who has the best patch panels and gaskets for the rusty brittle leaky rubber????? __________________ Current rides: 2013 Hyundai elantra gt DD 1995 camaro my first crush lmao Was: 1970 with a 350 4barrel and 288 horses Classics make it possible!

12-03-2008, 12:03 AM	#15
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: Leaking around windshield Thanks Bigsnookmaster ill try that

12-03-2008, 12:29 AM	#16
smoked68 Registered User Join Date: Oct 2006 Location: Rock Hill, SC Posts: 421	Re: Leaking around windshield Mine was doing the same, I was sealing something one day and figured what the hay. With finger and black RTV I mushed and smoothed all the way around. No more leaky and looks good too. I love it when a plan comes togeather. __________________ 1968 chevy shortbed, Dark Shadow Gray 4 bolt 383 Stroker,Weiand Super Charger, disc brakes, 9 inch, 391 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. 1966 Mustang coup, 306 roller, c4, 9 inch. 65 Cobra, 427, T6oo, 9inch, of course. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom



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12-03-2008, 08:19 AM	#17
Woody Registered User Join Date: Feb 2000 Location: Georgetown, KY, USA Posts: 631	Re: Leaking around windshield There are a couple seams where the cab was pieced together that the seam sealer dries up and cracks, that always leak. They are located under the Cowl and are about 6 inches in from each side. There also are seams above the windshield at the same locations that are prone to leaking. Using Black RTV in a caulk gun to seal around the windshield gasket (inside and outside) helps as well. But truthfully, this is only temperary and sooner or later you need to pull the windsheild and fix the seams and install a new gasket.

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