1998 Pontiac Grand Prix GTP from North America - Comments

I have a 1999 Grand Prix GT Coupe with only 32K miles that has been leaking water on the passenger side floor. It only seems to happen after a hard rainstorm. I have looked at all the seals, and all are in good shape. I was told at a GM dealer that the rain shield on the passeneger door needs to be replaced. They said it would cost about $150 and if it doesn't fix the problem... its back to square one. After reading the other comments about leaking on these cars, I am really surprised and disappointed. I love everything else about the car, but this seems to be a typical problem of these cars. I hope i'll be able to locate and fix this leak before it really does any damage to the car.

I just purchased a 1998 grand prix gtp and the fan squeaks. does anyone one know if a person can take the motor out and oil it? also I'm guessing that water is entering the car so I will want to fix it before spring. if someone has anymore details on how to fix it. please reply. my email bandit8623@aol.com.

The same thing happened to my 99 grand prix. Every time it rains now I get a pretty good amount of rain on my passenger side which comes through my blower motor. I already had to replace the blower motor once because before I didn't realize it was leaking and it eventually seized up the old one. Anyways, I finally traced my problem to a seal underneath the windshield cowling (its the long black plastic at the base of the windshield on the outside held on by some plastic screws). I lifted up the windshield cowling after removing both wipers and those plastic screws and found a rubber seal/deflector just laying down in there when it should be glued up along the base of the windshield to deflect the water to the left and right of the heater box. Pretty easy fix, prolly only took me 30 minutes or so to take it all apart, glue the piece back into place and put it all back together. Must be a problem though with the 97-2003 grand prix's since so many people have the same problem. I think the original glue that holds it up there eventually just gives away from all the bumps, heat, cold, etc that occurs over time. So good luck and hope this helps any fellow grand prix owners!!

Bulls EYE!!! the problem is in the windshiedl cowling as described by the previous comment. Thanks for your inputs.!!

I'm looking for some opinions and advice from some one who is familiar with SLP's GTX Grand Prix. We are the 2nd owners of this narley machine. We know the 1st owner was all into it, adding aftermarket parts, running it at the track, ect. Part of the problem is that I don't know where SLP left off, and this guy took over. I know that it has an SLP modded MPU chip. But to what extent (or stage) I'm not sure. The problem is that above around 2500-3000 RPMs it begins a nasty miss. Almost as if the rev limiter comes on way too early. I wonder if the chip is some how freaking out the rev limiter. It had some fat red Taylor high performance wires on it when we got it, that looked new. When the problem developed, everyone said wires, wires, wires. I thought it was some thing else. But I put some new wires on it (the same Taylor wires as before). It seemed to fix it, made a fool of me. 4 months later, its back. These wires, I routed very nice. And there are ceramic boot sleeves on the boots. As before, I do not believe its the wires. Also the nose bearing in the blower is sounding real bad. Any advice on that? We can't afford to just go buy a new blower. Also could these be related. Thank every one who reads this in advance.

Vochris74@yahoo.com.

To commenter 22:23:

Your electrical problems could be a coil pack or possibly a spark plug. As for the noise coming from the blower it could be the coupler bearing. Take a look on eBay and you can find rebuild kits for the supercharger that are surprisingly cheap.

We just purchased a 2004 grand prix gt and noticed water on the floor on the passenger side. We cannot find where it is coming in from. There is a lot of water and the carpet is soaked. Help!!!

I am in the same boat as you guys are... I have had my 98 Grand Am for several years. A week ago the kids and I get into the car (after a heavy rain) to find that all of the floorboards are completely soaked. The next day I look in my trunk to find that there seems to have been a leak there for a while (I had noticed a musty smell for a while and no matter what I did, I couldn't get rid of it. I didn't put 2 and 2 together though). All personal items were damaged and some had mold growing on them. Opened the cover (where the spare tire is) to find that the tire well is filled with water. We cannot determine where the water is coming in at! No cracked windows or dry rotted seals. No obvious signs of entry.

I have a 1998 Grand Prix GT, and after a heavy rain I have to get up and vacuum the passenger side floorboard. I went to the car wash and the same thing happened. I was watching it come in and it doesn't even touch high on the back of the floor board, just hits in the bend.

I heard that Pontiac will pay you to have it fixed. Can anyone let me know who or where I can go to find out how to resolve this issue? And also since I bought it used, is there anyway to find out if there is any recalls on the car, and how to go about getting the recalls taking care of?

You can email me at smiley_72476@hotmail.com Thank you very much Mrs. Wetfeet.

98 Grand Prix passenger side carpet soaked, replaced rubber gasket under cowling and checked seals in floor board, still having problem... seems like water is coming from underneath. Please help... jynglehymer@aol.com

1998 Grand Prix replaced blower motor, the passanger floor board is still soaked with water after a heavy rain. No holes under car. Please Help!!! jageebusha@yahoo.com.

I appreciate all of your help I've been beating my self up since last week. I got in my 2004 Pontiac Grand Prix last week and rolled my windows down without paying attention. Afterwards realized I had at least 3-4 inches of water in my passenger floor board. I really thought I left the window down. I have continued to sweep my car out. My husband and I just realized that was not the case at all. Now comes the fun part of finding which problem this is from all your guys help. Thank You wish us luck sounds like we will need it!

I have a 99 Pontiac Grand Prix GTP, and I keep getting water on the passenger floor board after a hard rain, and would like to know what all you have done to fix the problem, and which one actually fixed the problem? I've had to replace the blower once, but it was a long time ago and I'm constantly vacuuming out the water. Please, if there is any help out there for me, it would be greatly appreciated and checked into. Please help me.

Thanks,

GTP Lover.