29th Oct 2002, 14:59

1998 Pontiac Grand Prix leaking on floor passenger side as of Oct 2002. Supposedly had this fixed back in Oct 2001, paid 158.00 to dealership. Now they want another 140.00 to repair it again. By the way, this leak will eventually take out the fan blower motor (270.00) Fan will probably start to squeal. I am aware of two others besides my own. Any advice??

27th Jan 2003, 13:17

I have a 1998 grand prix SE. I am having what seems to be an electrical problem, but the dealer claims nothing is wrong with the car! It is fuel injected, but 8 out of 10 times I need to give it gas to start it and it stalls out when accelerating. My vent's give air according to the gas pedal and my lights sometimes get brighter with the gas pedal. when it stalls driving, I am accelerating and the car shuts off including the automatic lights, but the car gives no codes to explain the problem. when the car stalls it will start right back up, but the track off light won't go out till the car is shut off and started again. Is it possible I have to have an accident to find the problem??

27th Feb 2003, 11:28

I have a 2000 Pontiac Grand Prix and have recently developed a leak on the passenger side. Water is building up in the housing for the blower fan. Just FYI for the guy listed above who mentioned a similar problem.

14th Jun 2003, 12:33

I just bought a 2000 Grand Prix last week and we had a water leak in the passenger side floor board too. We just noticed it yesterday. We had it looked at by a friend who works for a Ford dealership and he said that it was a clog in the condensation drain. We are getting it fixed today. After reading this I am now worried that this might not be the true problem. Has anyone else heard this same thing too? If so did it fix the problem? If not then I will let you know if this works.

8th Jul 2003, 19:03

My wife owns a 2000 Pontiac Grand Prix and it to has been leaking a lot whenever it rains!! We were told that there is a website devoted to just this problem and Pontiac knows about it. Dealers will send in the statistics and not charge you, but Pontiac for the repairs. They are urging for a recall, but won't because it isn't safety related. The leaks are in the door seals and the water gets trapped in the door post and slowing drains out on the passenger side. If you own a Pontiac from 1998 to 2001 then after a rain, have someone in the passenger rear seat sitting and holding on, then someone drive the car and hit the brakes hard and the person in the back listen for water sloshing around in the door post, get it look at immediately and take the statistics to your dealer and have them send it on the Pontiac for payment.

16th Aug 2003, 23:48

I have a 2000 pontiac gtp and have twice had leak on the passenger side and both times had the fan blower replaced and the condensation drain cleaned. stated that leaves were getting into the system through the top hood vents.

The car only had around 15,000 miles and it only lasted each time about 9 months. And yes the fan belt squeaked and the carpet is soaked. Also anyone having problems with head gasket and cooling system problems with a 2000 pontiac gtp with only 36,000 miles.

6th Apr 2004, 22:34

Where there's a leak there's a HOLE! Best to stop leak is repalce all the rubber gasket or sealers from top to bottom including front and back windshields.

16th Aug 2004, 19:46

My wife's 1998 Grand Prix GT has had the same water leak problems for a few years. The first leak was from the right rear and the dealership replaced a missing seal. Lately, the car has been taking on inches of water in the front passenger side during rainstorms. After spending the last day tearing out the interior and looking for the source, it seems the cowl cover seal where it meets the windshield may be the culprit. Instead of running over the top of the cowl cover and into the drain grates, the water runs between the seal and windshield and then onto the top of the firewall. It then runs into the fan blower housing and into the interior of the car. I removed the old cowl seal and glue and replaced it with a slightly thicker one I had on hand. A preliminary test with a hose and copious amounts of water has not produced any more water in the interior. Hopefully, this will be a lasting repair. And yes, the blower motor is squealing like a banshee and needs to be replaced too...

15th Sep 2004, 10:59

I own a 1998 Grand Prix GTP with the electric moon roof. I was also getting a lot of water coming in on the passenger side during rain storms. As it turns out, the drains for the moon roof which are located on the front corners of the moon roof opening, were blocked by seeds from trees. The fix was to blow out the drains using an air hose.

27th Oct 2004, 09:52

I own a 1999 Grand Prix GTP with 96500 miles, I've owned the car since it's first mile. As of 2 yrs ago every time we get bad rain the front passenger side of the vehicle gets flooded, there is no sign of water anywhere else on the car, the door is dry, the dashboard is dry and looking under the dash their doesn't appear to be a source of water what so ever. I've been getting around this by parking under a car port, but would like to get this fixed. Does anyone know if this repair would be covered under an extended warranty contract. Any help is appreciated.

1st Nov 2004, 16:53

I own a 1997 GTP Grand Prix I bought new and have had problems since day one. The current problem is water leaking in on the floor board of the passenger side. Two car dealers could not locate the source of the leak. It is up under the dash behind the glove box, but cannot find where.

12th Nov 2004, 17:42

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.