pontiac bonneville rain water leaks into interior

Posted in the Autos Forum

1 - 12 of 12 Comments Last updated Mar 22, 2013

Bensalem, PA

#1 Dec 27, 2008
(1997 pontiac bonneville) Rain water leaking started in the rear floor and trunk, in fairly large amounts (galon +) but has recently started happening in the front foot wells also. There is no obvious place where it is getting in. Ee have tried putting a person in the trunk while hoseing the trunk area and roof down without any obvious leaks being detected? Is this common and is there a fix and/or recal on it?

United States

#2 Dec 29, 2008
My saturn had a problem which sounds the same...my drain line(from the a/c) was clogged,its seems this runs when the defrosters are on also. Crawled under and poked it WOW, extra bath.

New York, NY

#3 Dec 30, 2008
It's a 1997 and coming up on being 12 years old. Sell that old pig. They were never designed to last 12 years in the market. This is planned obsolescence, by now GM figured the powerstrain would have suffered a catastrophic failure, and since it hasn't the car is now resorting to its second planned failure mode of leaking water into the passenger compartment.

Since: Dec 07

the woods, Pa

#4 Dec 30, 2008
Look under the plastic vents beneath your windshield wipers. They can become clogged with leaves internally and cause water to leak under the dashboard. To the fellow above, this can happen to any brand vehicle if you park it under a tree.
Kathy Roberts

Bothell, WA

#5 Mar 10, 2011
I have a 1995 Pontiac Bonneville and it is leaking on the back seat floor of the driver's side. It starts there, and floods the entire floor after a good rain. I took it to a Waterleak Company in Lynnwood WA, and they replaced all the door trims, flasher's, gaskits, and watertested and said there were no more leaks. It cost $400. Took it home.....hmmmm....still leaking. Did you find a way to fix your leak? If so will you share it with me? robertskathy@comcast.net

United States

#6 Apr 13, 2011
Kathy, I am having the same problem with my bonneville. I have read a few places that the sun roof drains can crack and leak. Does yours have a sun roof? Have you resolved the issue yet?

Toronto, Canada

#7 Apr 27, 2011
hey i've done some checking and with leaks in trunk or rear floors are also a cause due to door seals and inside the door panel where a plastic sheet can loose it's glue and let water run into the car....as well rusted wheelwells can cause water to go into the trunk and interior as the water gets spread with the wheel while driving....i had a rusted wheelwell and since i fixed it trunk has been clean and interior .... only issue now is water comin under the dashboard from rains.....gotta love shamwow!

Erie, PA

#8 Aug 28, 2011
I have had a serious water leak in my 2003 bonneville. It is mostly on the rear passenger side floor. I had the sun-roof checked and there is NO leak from that. The trunk is dry so it's not coming from that. Does anyone know what is typical for a pontiac with soaked floor on the rear passenger side?

United States

#9 Dec 7, 2011
I see all these talks of problems but not answers....I'll just add my problem 2 then.
03 Bonneville, has a trunk full of water all of a sudden. It use 2 be the interior front roof. I started backing my car into my drive way which has a slight slop & now its just the trunk....
Anybody know y?

Since: Dec 11


#10 Dec 8, 2011
Has anybody checked to see if the rear sunroof drains are clogged or if the hose has a hole in it? it runs down the C pillar (the one at the back glass) and drops out in the fenderwell, if that is clogged, unhooked from the sunroof frame, or has a hole it would pour water in on that whole area, same as the front floorboards and headlinder, alot of times the hoses for the drains arent big enough to hold a large amount of water at one time and it will back up in the track and run in around the console up at the rear view mirror. and the only recalls on the 97 was..

Bulletin No.: 73-10-70
"Water Intrusion into Rear When Opening Lid"
Water Intrusion into Rear Compartment when Opening Rear Compartment Lid (Replace Back Up Lamp Seal)

1996-97 Pontiac Bonneville

Some owners may comment on water intrusion into the rear compartment when opening the rear compartment lid.

Condition may be due to water trapped around the back up lamp assembly which runs into the rear compartment when the rear compartment lid is raised.

Replace the back up lamp seal with a new designed seal, P/N 16520950.

Hope i answered a few questions for some people
Pontiac Girl

Hagerstown, MD

#11 Mar 20, 2013
I just bought a used 2000 Bonneville and realizing I have multiple leaks. I am being told these are common, and dont know yet whether or not this is accurate......The trunk leak is probably coming from the seal at the tail lights, and the interior leak that puddles my drivers side floor is either coming from the "A" Pillar (drivers) from the sunroof, or its coming from the cowl (under the wipers)?(Thats where to look if you dont have a sunroof). If anyone has other ideas, let me know, otherwise I'm hoping this information will work for me and maybe help some of you.

Webb City, MO

#12 Mar 22, 2013
beverly wrote:
I have had a serious water leak in my 2003 bonneville. It is mostly on the rear passenger side floor. I had the sun-roof checked and there is NO leak from that. The trunk is dry so it's not coming from that. Does anyone know what is typical for a pontiac with soaked floor on the rear passenger side?
I have a 2000 Bonneville and it does the same thing I had to pull the plug in the trunk to let the water out.

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