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2002 Pontiac Grand Prix GT 2dr Coupe

Trim Info:

Front Wheel Drive, 2 Door Coupe, Mid-Size
19 mpg city / 29 mpg hwy

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September 28, 2009, 5:47 pm

Chris G

Question: Have any fellow owners experienced water leaks?

I recently purchased a 1998 grand prix . I discovered a severe water leak into the interior of the car. The passenger side footwells front and rear are totally saturated after it rains. I tried spraying a hose over the outside of car, but can't find out where the leak is occuring The gaskets seem to be fine and I'm not experiencing abnormal road noise. Can anyone help me with this?

October 13, 2009, 10:14 pm

Bruce H

Most likely it is a strip of rubber dislodged underneath the windshield wiper cowl on the passenger side.

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December 4, 2009, 8:45 am

The lower sill is rusting out and water is getting in there when it is splashed up from the tires. For some reason, GM has a hole on the floor pan right underneath the door that they "filled" with a sticky glue. I found that this glue wasn't adhering anymore and water was splashing up into the rusted out lower sill and then getting past this bad glue. The best way to fix this would be to pull back the carpet, remove the sticky glue and then weld on a piece of new steel over this hole. I covered up this hole with some plastic and adhered it RTV sealant. Then I sprayed some expanding foam sealant into the rusted out section of the sill to keep the water from even getting in there. Probably not permanent but it works now.
i don't understand why someone would design this hole in there in the first place and then to cover it with a glue that doesn't last. And let me complain about the sill as well. This sill (which is covered by the body kit plastic on the GT model) has some oblong holes on the bottom for some reason. I found that these holes were the perfect spt for sand and salt to sit and then rust out from the inside. I tried cleaning these out as often as I could but they fill up fast because they are directly behind the front tire. What was the purpose of these oblong holes in the first place?

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