Water Leak Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Marc33 · 01-03-2011, 01:17 PM

I have a 71 GMC C20, when it rains I have water coming into the truck(carpet is very wet) on the drivers and passenger floorboards, closest to the sides. NO holes in floors.

Possibly coming in through the side vents or ??

Anyone know how to fix this? It leaks with the vents open and closed.

cdowns · 01-03-2011, 01:22 PM

if sealant in drip rails is dry and cracked the rain water goes in and down the roof pillars down thru vents

Willys47 · 01-03-2011, 01:43 PM

above the dash in the wipers area there are some body seam that could be rusting through and lealing mine were.

oldblue1968chevy · 01-03-2011, 03:13 PM

behind glovebox i have a big rusted out hole, thats wehre mine comes from

vectorit · 01-03-2011, 03:42 PM

Has the windshield been replaced, and the weatherstrip as well?

In my Suburban, the rubber seal doesn't seal to the glass very well on the driver side. It's like the channel that the glass sits in is to wide for the glass, and I get water pooled up on my dash and drips down the kick panel and makes the carpet wet.

Marc33 · 01-03-2011, 03:50 PM

I dont have any holes in the firewall or the channel on the firewall.

I'm guessing its the seal on the drip rail or the windshield, however the top of the dash is never wet.

Best solution to fix the drip rail channel? Silicone?

**LockDoc** · 01-03-2011, 03:55 PM

Quote:

Originally Posted by Marc33

Best solution to fix the drip rail channel? Silicone?

I wouldn't. 3M has a product just for that purpose.

I added a picture of where mine was leaking at the lower windshield seam. I cleaned all of the seams out and re-caulked them. It can also leak in at the antenna cable if it is not sealed good.

LockDoc

Marc33 · 01-05-2011, 12:31 PM

Thank you to all. I will wait for it to dry out here a little, been raining so much, and try your advice.

68 IRON · 01-05-2011, 01:05 PM

How many trucks in Cali, do you think, are sprouting leaks these days?!?

flashed · 01-05-2011, 11:27 PM

Mine leaked real bad just like you described in the floor too. I cleaned the channel on top of the cab and used brush on seam sealer (also available in tubes like caulking)in the channel. I also brushed it inside the cowl area at the front all the way across .It rained all day today and for the first time since I bought this truck a year a go it did not leak.

01-03-2011, 01:17 PM	#1
Marc33 Registered User Join Date: Feb 2010 Location: San Marcos, Ca Posts: 109	Water Leak Question I have a 71 GMC C20, when it rains I have water coming into the truck(carpet is very wet) on the drivers and passenger floorboards, closest to the sides. NO holes in floors. Possibly coming in through the side vents or ?? Anyone know how to fix this? It leaks with the vents open and closed. __________________ Current stable: 1970 K5 Blazer 4x4 1972 K5 Blazer 4x4 SOLD: 1971 GMC Sierra Grande 2500 2wd 1972 Chevrolet K5 Blazer 1966 Chevrolet C20 1972 Chevy Suburban 4x4 1500 1956 Chevy 150 2 door post 1956 Chevy 2 door post bel air 1968 Chevrolet C20 1958 Ford Thunderbird 1968 4x4 Suburban 1/2 ton

01-03-2011, 01:22 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Water Leak Question if sealant in drip rails is dry and cracked the rain water goes in and down the roof pillars down thru vents __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-03-2011, 01:43 PM	#3
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: Water Leak Question above the dash in the wipers area there are some body seam that could be rusting through and lealing mine were. __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!!

01-03-2011, 03:13 PM	#4
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Water Leak Question behind glovebox i have a big rusted out hole, thats wehre mine comes from __________________ 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

01-03-2011, 03:42 PM	#5
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: Water Leak Question Has the windshield been replaced, and the weatherstrip as well? In my Suburban, the rubber seal doesn't seal to the glass very well on the driver side. It's like the channel that the glass sits in is to wide for the glass, and I get water pooled up on my dash and drips down the kick panel and makes the carpet wet. __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

01-03-2011, 03:50 PM	#6
Marc33 Registered User Join Date: Feb 2010 Location: San Marcos, Ca Posts: 109	Re: Water Leak Question I dont have any holes in the firewall or the channel on the firewall. I'm guessing its the seal on the drip rail or the windshield, however the top of the dash is never wet. Best solution to fix the drip rail channel? Silicone? __________________ Current stable: 1970 K5 Blazer 4x4 1972 K5 Blazer 4x4 SOLD: 1971 GMC Sierra Grande 2500 2wd 1972 Chevrolet K5 Blazer 1966 Chevrolet C20 1972 Chevy Suburban 4x4 1500 1956 Chevy 150 2 door post 1956 Chevy 2 door post bel air 1968 Chevrolet C20 1958 Ford Thunderbird 1968 4x4 Suburban 1/2 ton

01-05-2011, 12:31 PM	#8
Marc33 Registered User Join Date: Feb 2010 Location: San Marcos, Ca Posts: 109	Re: Water Leak Question Thank you to all. I will wait for it to dry out here a little, been raining so much, and try your advice. __________________ Current stable: 1970 K5 Blazer 4x4 1972 K5 Blazer 4x4 SOLD: 1971 GMC Sierra Grande 2500 2wd 1972 Chevrolet K5 Blazer 1966 Chevrolet C20 1972 Chevy Suburban 4x4 1500 1956 Chevy 150 2 door post 1956 Chevy 2 door post bel air 1968 Chevrolet C20 1958 Ford Thunderbird 1968 4x4 Suburban 1/2 ton

01-05-2011, 01:05 PM	#9
68 IRON Registered User Join Date: Sep 2010 Location: Olympia, WA Posts: 736	Re: Water Leak Question How many trucks in Cali, do you think, are sprouting leaks these days?!?

01-05-2011, 11:27 PM	#10
flashed Registered User Join Date: Oct 2009 Location: canton ga Posts: 12,724	Re: Water Leak Question Mine leaked real bad just like you described in the floor too. I cleaned the channel on top of the cab and used brush on seam sealer (also available in tubes like caulking)in the channel. I also brushed it inside the cowl area at the front all the way across .It rained all day today and for the first time since I bought this truck a year a go it did not leak.



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