where's the water coming from? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vanislejimmy · 11-29-2010, 04:31 PM

Hey everyone. I usually hang out on the 67-72 forum, but I'm looking at this 'burb. It seems really nice. The only problem is when I pulled back the floor mat on both sides the underlay was wet. On the driver side i think it's running down in the corner where the floor and kick panel meet. On the passenger side it'd coming down in the corner too, and it was wet all along the bottom of the heater. Where do these trucks normally start leaking? Any ideas would be helpful. Thanks

http://www.dennisjonssongm.com/used/...3f3c68fdb2.htm

77 350 Shorty Wide · 11-29-2010, 05:02 PM

It sounds like part of the problem is a leaking heater core. God Bless, Terry

vanislejimmy · 11-29-2010, 05:26 PM

It was just water. No anti freeze in it.

babyJay · 11-29-2010, 05:36 PM

Maybe under the windshield gasket. Does the truck have much rust? Do you see anything down inside the cowl around the wiper linkages?

Greenlee · 11-29-2010, 05:42 PM

I have had two of these trucks leak in the area under the cowl. The seam sealer deteriorates and rust starts forming under the cowl, along the firewall and on the floor under the carpet. Check for rust!

vanislejimmy · 11-29-2010, 08:22 PM

I never looked under the cowl. I'm guessing it was stored inside before, as there is no rust at all. How hard is the seam sealer to repair?

masterlock · 11-29-2010, 09:41 PM

If it is the same issue I had with my 77 it is coming from the corner of the windshield, water builds up there rusts under the gasket, pools in the corner of the dash and flows on down to the floor, then it settles on the rib that holds the door gasket on the floor and rots that out, make sure you pull that gasket up and check the floor there.

vanislejimmy · 11-29-2010, 11:19 PM

There's no rust anywhere on the floor. The truck must have been stored inside most of its life because there is only one rust spot about the size of a dime on the truck. I'm going back tommorrow to take a closer look at it.

datguysaL · 11-29-2010, 11:42 PM

could be coming from the flaps behind the plastic under the dash. the plastic that covers the bottom sides.

my truck had the same problem.
that flap is vacuum operated. and it was stuck open cuz a couples leafs didnt let it shut.

11-29-2010, 04:31 PM	#1
vanislejimmy Registered User Join Date: Jan 2007 Location: Vancouver Island, British columbia Posts: 138	where's the water coming from? Hey everyone. I usually hang out on the 67-72 forum, but I'm looking at this 'burb. It seems really nice. The only problem is when I pulled back the floor mat on both sides the underlay was wet. On the driver side i think it's running down in the corner where the floor and kick panel meet. On the passenger side it'd coming down in the corner too, and it was wet all along the bottom of the heater. Where do these trucks normally start leaking? Any ideas would be helpful. Thanks http://www.dennisjonssongm.com/used/...3f3c68fdb2.htm

11-29-2010, 05:02 PM	#2
77 350 Shorty Wide Registered User Join Date: Dec 2006 Location: Yakima, WA Posts: 325	Re: where's the water coming from? It sounds like part of the problem is a leaking heater core. God Bless, Terry

11-29-2010, 05:26 PM	#3
vanislejimmy Registered User Join Date: Jan 2007 Location: Vancouver Island, British columbia Posts: 138	Re: where's the water coming from? It was just water. No anti freeze in it.

11-29-2010, 05:36 PM	#4
babyJay Arrived on a Pale Horse Join Date: Mar 2007 Location: SnagTown Indiana Posts: 2,524	Re: where's the water coming from? Maybe under the windshield gasket. Does the truck have much rust? Do you see anything down inside the cowl around the wiper linkages? __________________ Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW

11-29-2010, 05:42 PM	#5
Greenlee Registered User Join Date: Jun 2004 Location: El Lago, TX Posts: 1,668	Re: where's the water coming from? I have had two of these trucks leak in the area under the cowl. The seam sealer deteriorates and rust starts forming under the cowl, along the firewall and on the floor under the carpet. Check for rust!

11-29-2010, 08:22 PM	#6
vanislejimmy Registered User Join Date: Jan 2007 Location: Vancouver Island, British columbia Posts: 138	Re: where's the water coming from? I never looked under the cowl. I'm guessing it was stored inside before, as there is no rust at all. How hard is the seam sealer to repair?

11-29-2010, 09:41 PM	#7
masterlock Registered User Join Date: Jul 2010 Location: San Diego, CA Posts: 281	Re: where's the water coming from? If it is the same issue I had with my 77 it is coming from the corner of the windshield, water builds up there rusts under the gasket, pools in the corner of the dash and flows on down to the floor, then it settles on the rib that holds the door gasket on the floor and rots that out, make sure you pull that gasket up and check the floor there. __________________ 77 Stepside http://67-72chevytrucks.com/vboard/s...d.php?t=422253

11-29-2010, 11:19 PM	#8
vanislejimmy Registered User Join Date: Jan 2007 Location: Vancouver Island, British columbia Posts: 138	Re: where's the water coming from? There's no rust anywhere on the floor. The truck must have been stored inside most of its life because there is only one rust spot about the size of a dime on the truck. I'm going back tommorrow to take a closer look at it.

11-29-2010, 11:42 PM	#9
datguysaL Registered User Join Date: May 2009 Location: Houston, TX Posts: 155	Re: where's the water coming from? could be coming from the flaps behind the plastic under the dash. the plastic that covers the bottom sides. my truck had the same problem. that flap is vacuum operated. and it was stuck open cuz a couples leafs didnt let it shut.

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