- #2 of 48
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Water Leak
by eric227
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Oct 23, 2002 (10:46 am)
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I have a '98 Grand Prix that started leaking water to the passenger floorboard during severe rainstorms. This happened about a year ago. I took it to the dealer and they checked the A/C and found nothing plugged up. At the time the molding around the windshield on the passenger was loose. However, that didn't seem to be the cause either. They thought it might be a cowl leak and told me to take it an auto body/glass place. The auto body/glass place looked at it and said it wasn't a cowl leak but that it appeared a was missing near the vents for defrosting (underneath the wipers). When a hose was run over this portion of the car water would run in on the passenger side footrest. The body shop even demonstrated this for me with the carpet pulled up. They said I should go back to the dealer and ask about this apparent missing piece. Went back to the dealer and they said nothing was supposed to be there. They even showed me a new Grand Prix to compare to.
I ended up going back to the body shop and paying $300 for them to make something to run the water another way by the vents and I haven't had a problem since. Wasn't happy, but it was raining a couple of times a week and I was tired of bailing out my car.
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- #3 of 48
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Re: Water Leak [eric227]
by ndclark
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Aug 11, 2004 (12:20 pm)
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Replying to: eric227 (Oct 23, 2002 10:46 am)
I also have encountered the same problem with my 1998 Pontiac Grand Prix. When it rains really hard the passenger side floorboard will fill with water. I was in the car when it was raining hard and the water was draining directly under the dashboard from the top of the floorboard. Its lovely to have wet wires and im waiting for a major electrical problem soon. If anyone has an idea about what this may be from please help a guy out. I heard it could be from the heater core but Im not sure if that makes sense? Thanks!
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- #4 of 48
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Re: Water Leak [ndclark]
by Mr_Shiftright HOST
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Aug 13, 2004 (9:28 am)
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Replying to: ndclark (Aug 11, 2004 12:20 pm)
Sounds like the fresh air vent drains (under your windshield wipers)are clogged. These drains allow water to escape into drains that usually exit just back of the front wheels.
If you carefully poured just a teacup of water down the vent grilles, you should see water exiting under the car. If you don't, the drains are clogged with bio-matter and the water rises and rises until it spills into the car itself behind the dash.
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- #5 of 48
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Re: Water Leak [ndclark]
by condor
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Feb 23, 2005 (5:06 pm)
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Replying to: ndclark (Aug 11, 2004 12:20 pm)
Same problem here (2000 Pontiac Grand Prix). Easy repair. There is a poorly secured waterguard under the plastic lip which loosly seals agains the length of the windshield. I found the issue, placed the waterguard back over the steel lip (which is all found under the black plastic. For good measure, I laid a bead of silacone between the plastic and winshield along the passenger side. Without the waterguard in place, water is channeled directly into the A/C air intake. That drains into the fan motor casing which eventually overflows onto the floor board. I found this out by placing a garden hose on my windshield and removing my glove compartment door. Haven't had a leak since.
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- #6 of 48
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Re: Water Leak [condor]
by rwarner1
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Apr 25, 2005 (9:16 am)
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Replying to: condor (Feb 23, 2005 5:06 pm)
Same issue I'm currently dealing with. What are the steps for removal.
Remove Wiper.
Remove Plastic cover?
Then what?
Is the waterguard or seal visible at this point?
Any help is appreciated. Right now I have to change cars with my wife when it rains. She can park in a parking garage at work, I can't.
Please reply also if possible to rwarner1 columbus.rr.com
Thanks,
RW">link title
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- #7 of 48
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Re: Water Leak [rwarner1]
by john59
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Apr 25, 2005 (11:22 am)
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Replying to: rwarner1 (Apr 25, 2005 9:16 am)
I have a 99 Grand Prix. I had to replace my windshield over a year ago. Ever since, my floor boards on both the driver and passenger sides are soaked after a heavy rain. Could this be due to the windshield replacement? Maybe glass repairman's fault?
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- #8 of 48
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Re: Water Leak [ndclark]
by melodyj
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Jun 21, 2006 (9:18 am)
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Replying to: ndclark (Aug 11, 2004 12:20 pm)
I bought my car in Jan. 06. 1998 Grand Prix. Every time it rains my passenger side floorboard has 1-2 inches of water. No the ac drainage pipe (whatever it is) is not clogged. I had some wires short out 3 days ago and now my ac, radio and display lights will not work. My brother pulled out glove box for a look and found a box, audio amplifier that looks fried, could this be my problem causing the ac, radio and display lights not work. I need help, no one seems to know anything about this problem here. And how do I stop the Leak???!!!???
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- #9 of 48
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Re: Water Leak [melodyj]
by mostro186
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Jul 06, 2006 (7:07 pm)
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Replying to: melodyj (Jun 21, 2006 9:18 am)
Meldoy, sister! I had the same problem with my '98 GT! Thought it was a crack or leak on windshield. It was the water regulator inside the bottom of the windshield! It just needed to be set back in place. Have someone remove the plastic plate holding your windshield on (Lower). It's rubber and easy to fix. Don't pay someone to do it you can do it yourself grilfriend!! I HOPE this is your solution! I almost know it is!  Marie
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- #10 of 48
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Re: Water Leak [Mr_Shiftright]
by naseem641
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Sep 13, 2006 (12:04 pm)
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Replying to: Mr_Shiftright (Aug 13, 2004 9:28 am)
I have the same exact problem with my car... i poured water down the vent grills and the water came ou the bottom like its supposed to... now i jus took it to a mechanic and he said they have to take off the whole entire dashboard and do something with the water heater... i do not understand how all this water can come from a water heater? They want to charge me 325$ and id rather get a simple solution and do it myself.
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- #11 of 48
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Re: Water Leak [naseem641]
by escambiaguy
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Sep 14, 2006 (5:17 pm)
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Replying to: naseem641 (Sep 13, 2006 12:04 pm)
I have a 99 Grand Prix GT and have the same problem. One day after a heavy rain I was driving and when I made a lefthand turn water started gushing from underneath the dash. I could hear it going through the a/c fan motor. The dealership said it was the a/c drain line and charged me to unstop it. Needless to say, it messed up my blower and resistor, which were easy fixes. The car also now has a musty smell. I still have my doubts if this problem is really solved. I never drive it in the rain anymore. I decided to sell it because i'm tired of worrying with it.
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