water leak under dash

water leak under dash

Postby Loyda [OP] » October 25th 2012, 4:55am

Have a 95 astro , that when it rains water leaks into the interior under the passenger side dash, onto the floor
Any ideas? maybe a plug or a drain hose ?
Thanks
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Re: water leak under dash

Postby astroracer » October 25th 2012, 12:38pm

Pull the cowl screen (under the windshield wipers) and look for a plugged drain or a rust hole in the cowl. Leaves and dirt collect in there and can rust it out.
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Re: water leak under dash

Postby Philly758 » October 25th 2012, 2:03pm

I know you said this is after it rains and you may be right... But the last time I had water on my passenger side floor it was leaking from my heater core and smelled terrible. It was around this time of the year when I started running my heat again.
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Re: water leak under dash

Postby chrisgerman1983 » October 25th 2012, 2:30pm

I have given this advice before but it really does work very well... Tonic water and a black light is the best way of tracking down a leak. Have somebody inside (in the dark) with a black light while you pour a couple bottles of tonic water over the window or wherever you suspect the leak is coming from. The tonic will glow bright green and you will know exactly where its coming from. My wife had a leak in here car that lead me to ripping out the interior and truck bed lining the entire car and sealing every crack or weld I could find... it still leaked :banghead: then I found out that tonic water glows, found the leak in less then five minutes. It turned out that the fresh air valve was letting water in...
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Re: water leak under dash

Postby Big_kid » October 26th 2012, 12:30am

I never knew that- thanks for the tip!

When my wife's Villager was leaking I ended up taking out the interior, sprinkling it with baby powder, and spraying down the outside with the garden hose. It was under the cowl, exactly where I never did find. I sprayed a boatload of undercoating at the general area and sealed it that way.
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Re: water leak under dash

Postby sfeaver » October 26th 2012, 12:50am

When mine leaked onto the passenger side floor mat, it was the windshield at the top left corner... Lifting up the seal, and adding some windsheild urethane fixed it up. try spraying the hose on the van and see where it comes from..

I like the tonic water idea too, didnt know a UV light would light it up!
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Re: water leak under dash

Postby Loyda [OP] » October 26th 2012, 2:54am

Its definitely isnt coolant, will try looking in the cowl sat
Thanks
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Re: water leak under dash

Postby Lumpy » October 26th 2012, 4:02pm

I didn't know about the tonic water trick either. Maybe that's why scorpions glow green under blacklight. They must drink the stuff.


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Re: water leak under dash

Postby Loyda [OP] » October 28th 2012, 5:00pm

poured water in the cowl vent , all around windshield and above doors and didnt leak ! weird that it only leaks when it rains ????
strange !
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Re: water leak under dash

Postby sfeaver » October 28th 2012, 5:16pm

I had a leak that I had to pull the fender off. The body seam sealer had dried out and was leaking in there... If you have an air compressor, spray soapy water around the top of your windshield seal. Then blow air from the inside around the perimiter of the windshield. I had a leak there once and that was a fairly easy way to find it.
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Re: water leak under dash

Postby diego89 » October 29th 2012, 10:25pm

When mine had a leak the passenger side would get wet.. water was getting in through the back door from the plastic that holds down the carper. Silicon took care of the problem
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Re: water leak under dash

Postby chrisgerman1983 » October 30th 2012, 2:55pm

sfeaver wrote:I had a leak that I had to pull the fender off. The body seam sealer had dried out and was leaking in there... If you have an air compressor, spray soapy water around the top of your windshield seal. Then blow air from the inside around the perimiter of the windshield. I had a leak there once and that was a fairly easy way to find it.


good idea!
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