It is possible for the water to hang out somewhere. Then come out later? I did this mod open my car today's later and had tons of water. It seems to be coming from the motor.
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07-06-2015
It is possible for the water to hang out somewhere. Then come out later? I did this mod open my car today's later and had tons of water. It seems to be coming from the motor.
07-06-2015
pull the pass side carpet back and run a hose over the roof down the windshield to the cowl. see if it leaks inside.
11-29-2015
Glad I found this forum! Just replaced a 1995 Bonneville with a 2004 Grand Prix, and I had plenty of water issues with the Bonneville. I want to avoid that with the Grand Prix, and when I take it in to get some other service work done I'll ask the dealership to install this water deflector (part # 15794785). Looks like it would be easy to do myself, but since I'm going to have it in anyway, I don't mind paying them to get it taken care of.
12-10-2015
It doesn't even look that hard. Or if you want, RTV the towel to the windshield itself and you won't have to remove anything.Originally Posted by jbeall
11-29-2015
You're going to pay $80 to install that part? They're going to charge your an hour of labor. Find someone from the forums to help you install it.
12-13-2015
I checked my 06, and this water deflector was already there. Not sure if it was installed or came from the factory with it.
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01-15-2016
Thanks for the write up Abrasive.
Installed the updated deflector in my 03 GP GT this morning. Quick and easy to do.
04 and up should already have this installed.
01-20-2016
The part was $4.95 at my dealership. Took less time to install than it did to drive to town and pick it up. I also found out that there was already a cabin air filter in my red GT. This weekend the gold GTP will be getting the same treatment.
It was funny at the dealership: the parts guy said he's never seen a GM part that size go for so little money. (Neither have I!).
OH, I don't see where anyone posted the part number for the cabin air filter. I used Fram CF8392A on my '00 GT.
01-26-2022
Okay, so I know the last post in this thread was from 2016, but I'm buying a 98 GTP that the owner says has the water leak issue. I checked the part # on line for current price and availability and this part is now $50-$65! Can someone please advise what cars this deflector came in standard so I can search the junkyards for one?
01-27-2022
wtf man. i had to search for it myself. thats nuts.
i paid like 8 bucks for mine off ebay years ago.
01-29-2022
Quick look and found this
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