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1999 Grand Prix Leaking water
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tillage-director
Posted 4/14/2011 21:57 (#1724711)
Subject: 1999 Grand Prix Leaking water



Central MN
I am posting this for my Dad because it would take him a couple days to type up this message! HAHA My sister has a 99 grand prix. Dad was doing some work on it today and discovered the the floor under the floor matt on the passenger side was soaked with water. He doesn't think its a leak from the window as he thinks that would be pretty obvious. He aslo doesn't think the moisture is anti freeze. Does anyone have an idea of where this water could be coming from?
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Kooiker
Posted 4/14/2011 22:09 (#1724756 - in reply to #1724711)
Subject: RE: 1999 Grand Prix Leaking water



Has she been using the AC or more likely the Defrost?

 

If yes then it could be water from the condensor.



Edited by Kooiker 4/14/2011 22:13
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swne
Posted 4/14/2011 22:12 (#1724767 - in reply to #1724711)
Subject: Re: 1999 Grand Prix Leaking water


Cambridge, southwestern Nebraska
Had a similar situation with my '01 Dodge pickup. Turned out that it was condensation from the AC condensor. I don't remember what the fix was but it got fixed.
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GinNB
Posted 4/14/2011 22:18 (#1724784 - in reply to #1724711)
Subject: RE: 1999 Grand Prix Leaking water



Door seal?  Leaking around the windshield?  Maybe run the hose on it to see if you can find a leak from outside.

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tillage-director
Posted 4/14/2011 22:26 (#1724803 - in reply to #1724711)
Subject: Re: 1999 Grand Prix Leaking water



Central MN
Been to cold to run the air here. I told him maybe she has a bad seal
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Kooiker
Posted 4/14/2011 22:56 (#1724897 - in reply to #1724803)
Subject: Re: 1999 Grand Prix Leaking water



If she uses the defroster the AC unit is running.

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mack
Posted 4/14/2011 23:19 (#1724944 - in reply to #1724711)
Subject: RE: 1999 Grand Prix Leaking water


Western Illinois
This is a common occurance for that model of Pontiac. Do a internet search on it and you will find your answer-I wish I had the link for you. Also try a youtube search. The problem is a seal has come off under the black plastic that is located at the base of the windshield. Pop the plastic off ( one piece or two depending on what year) and you will see the seal that has came off. Re apply with some silicone and you got it fixed. A friends car had the same issue-when it rained he would have a half inch on his flooboard.
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Paul 777
Posted 4/14/2011 23:20 (#1724946 - in reply to #1724897)
Subject: Re: 1999 Grand Prix Leaking water


W. Central MN
Probably the windshield seal. Check it all around as the water can follow the seal for several inches before dropping to the floor. My leak was closer to the rear view mirror than the door but the water still ended up on the floor mat.
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Hampton
Posted 4/14/2011 23:46 (#1724998 - in reply to #1724711)
Subject: RE: 1999 Grand Prix Leaking water


You need to install a deflector under the cowl. Part is $5 or so and takes about 15 min to install. Follow the link for a great how to write up.

http://www.grandprixforums.net/water-floorboard-take-2-permanent-fi...
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SamsDad
Posted 4/15/2011 07:06 (#1725172 - in reply to #1724944)
Subject: RE: 1999 Grand Prix Leaking water


Western EC Iowa

I'd say you have it right.  Had the same problem on a Grand Am a little older.  All I had to do was tighten the plastic up and it didn't leak, but a little silicone will make sure the job is done right.  Ben

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