Last post on Jul 06, 2013 at 5:22 PM
You are in the Pontiac Grand Prix
What is this discussion about?
Pontiac Grand Prix, Auto Repair, Sedan
Jul 24, 2007 (10:28 am)
I have a 1998 pontiac grand prix gtp coupe and my passenger side floor gets flooded everytime it rains.
Temporary solutions seem to be that when I park the car DOWNHILL, water doesn't seem to get into the passenger side floor. When parking straight or even uphill, that's when the water starts coming in.
I'm going to try some of the suggestions on this forum to see if I can fix it completely.
#31 of 64 Re: Water Leak [nategrey]
Jul 26, 2007 (8:47 am)
The body shop finally found out what was wrong with the car. They said the seal on the windshield was bumpy and was letting water in. They also said there was a loose cowl, which was diverting water into the car. It was a good soaking rain the day after I picked it up, and I checked the car. No leaks. Clean as a whistle. I am very happy this was finally solved. They had the car for almost two weeks trying to figure out what was wrong with it. I was so worried it would not be solved. I would suggest looking to see if there is a problem with the cowl which probably has something to do with the majority of all grand prix leaks. I saw there was a recall about it on pontiac website. Also try looking at the windshield to make sure it is sealed all the way. These problems could be an issue since your leak is coming in the same side mine was.
Aug 09, 2007 (4:43 am)
My 2000 gran prix has been leaking water in the front passenger side also, i fixed the rubber seal as stated in another post and this solved the rain problem but now the air conditioner is leaking into the same area just as bad as when it rains, i know its the a/c because it leaked on a sunny hot day with no rain, i read of a fix on an a/c drain line in another message, does someone know the exact way to unplug the line? any help is greatly appreciated.
#33 of 64 Re: Water Leak [brybry]
Aug 27, 2007 (5:45 pm)
This worked for me but I would add. You might want to go to Auto Zone and buy some 5/16" nylon rivets, 961-060 by Dorman before you pry them out, because they are worthless after you pry them out. Also there is a another cap on my 2001 with a flat line that screws out which is reusable. It's also advisable to pry the rivets out from under the hood so you don't damage your windshield, I used a nail puller.
Sep 27, 2007 (12:45 pm)
What is a COWL and where is it located?????
#35 of 64 Re: Water Leak [henriejo]
Dec 25, 2007 (12:31 pm)
I am having the same problem. Did you ever isolate the cause of your leak on the back passenger floorboard?
Dec 26, 2007 (5:45 am)
No, I sure didn't. Even with the new windshield it happened again. I was able to find the spot where it came in, way up under the dash, you'll find an opening you can put your finger through. Why it's there I don't know.
I actually sold my car a couple of weeks ago.
#37 of 64 Re: Water Leak [netman1]
Dec 26, 2007 (5:57 am)
Hey just wanted to reply to you.
I have not had a problem with that spot again .
I took my car to the dealer they found a leak in the cowl .They also wanted to charge me $ 325.00 to fix it even though it was still under warranty. and still is
I plan to traed it in this spring
#38 of 64 Re: WATER LEAK [bigskidogg]
Apr 08, 2008 (4:48 pm)
I am also interested in unplugging the a/c drain line. Does anyone have ideas? I have a 2001 Grand Prix. The other tips have been helpful but my car is also getting wet on the front passenger side floor on warm dry days when I use my air conditioner. The blower is leaking water. Any help would be greatly appreciated. Thanks.
#39 of 64 Re: WATER LEAK [jamijan]
Apr 09, 2008 (1:43 am)
I was finally able to get this issue solve, i found the rubber strip that is under the plastic piece by the windshield and sure enough it was off so i glued it on with some rubber cement. fixed the rain problem but still had the ac condensation flowing back up because the drainage tube was clogged. couldnt find it on my own, took it to a garage that my father recommended and he put it up on the lift and showed me where it was at and stuck a small phillips screwdriver or and small thin metal object to stick up the tube and unplug it. it took like 2 seconds. it is hard to see the tube i wouldnt have found it on my own but on a lift it was easier to locate . it came down right around where the engine and tranny are, pretty much directly inline with the firewall but it was a very small tube like an 1/8 inch or something. the end of it was greenish because of the mold and gunk so it really didnt look like it could have been the tube but he stuck the screwdriver about 1 inch or so up into it and all of the water which wasnt really alot came right out and it solved the problem. you might be able to find it if you put it up on jack stands and have a little room to look around, that was my problem, i couldnt really see it from just looking underneath. but once it was on the lift it was definitely findable. good luck. i believe this will solve your problem.