Water in floorboard (Take 2) - The Permanent Fix

**prattm** · 03-19-2015

Ok...question
I put the deflector piece on last month, and still a little water is getting in.
Any ideas where or how this is happening?

**02NavyBlue** · 03-19-2015

Time to start looking where the water is coming from. Or is it still coming from the HVAC case?

**grazin** · 03-20-2015

Ok, just a quick question. Is this new piece available through gm? Or is it being sold by a member.. I have an 03 gtp and haven't noticed any water, but why wait until it does leak. The reason I ask is because people are ordering these from the original poster..

**HighOctaneRacing** · 03-20-2015

Originally Posted by grazin

Ok, just a quick question. Is this new piece available through gm? Or is it being sold by a member.. I have an 03 gtp and haven't noticed any water, but why wait until it does leak. The reason I ask is because people are ordering these from the original poster..

Yes it is available through GM. It's about $4 at the dealer.

**Scottydoggs** · 03-20-2015

no one is ordering them from any one here. you search the part # thats given in the first post and buy it on line, amazon, ebay, or the dealer is not to bad on this part.

**02NavyBlue** · 03-20-2015

He's talking about when the thread started, they weren't easily available and someone on here sold some.

But yeah you can buy them lots of places with the p/n

**Scottydoggs** · 03-20-2015

whats pretty funny is the plastic bag mod i did is still working fine on my cowl deflector.

**grazin** · 03-21-2015

Hey thanks allot Scott and blue.. you guys are a big help.. I think this is another one to add to the list.. thanks again..

**firstdue** · 06-10-2015

Ordered my second one for my second Grand Prix after a hard rain left water on my passenger side. I had even more water on my drivers side floor. Checked and both sunroof drains are clear. I found water around the speaker cover on the drivers door.

Thanks for the great write up!

**rockystar99** · 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.

**Scottydoggs** · 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.

**jbeall** · 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.

**Deezul_AwT** · 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.

**SubwayGuy** · 12-10-2015

Originally Posted by jbeall

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.

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.

**02NavyBlue** · 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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**Rod2003GT** · 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.

**skills4lou** · 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.

**Pairsnpaint** · 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?

**Scottydoggs** · 01-27-2022

Originally Posted by Pairsnpaint

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?

wtf man. i had to search for it myself. thats nuts.

i paid like 8 bucks for mine off ebay years ago.

**The Guz** · 01-29-2022

Originally Posted by Pairsnpaint

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?

Quick look and found this