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Wet floor after driving in rain - drivers side front and back

(1991 Oldsmobile 98)
in Saint Paul, MN on September 11, 2009
I took out the seats and all the floor mats and could not see any holes. I ran water over the front around the windshield wiper area - no leaks.
The other day after driving in the rain the driver's side front was very wet and the back was even wetter. I'm guessing at least several quarts of water.
Displaying 3 answers & 1 comments
Popular Answer
on January 10, 2010
As I've perused different forums related to Oldsmobiles, specifically the 1990's Delta 88, I've seen a number of posters asking for help related to why there was water in the interior of their cars.

The answers have run the gamut from dealers saying the car needs new door seals, to helpful suggestions that there may be rust on the pans and the water is coming up from below, etc.

Well, recently I ran into this problem with a '95 Delta 88 LSS. For the life of me, I couldn't figure it out. The right rear passenger and front passenger floors would be wet for several weeks, for no apparent/discoverable reason. I went so far as to run the passenger seat all the way forward and drill a 1/4in hole through the carpet and floorboard for drainage.

THEN one day I popped the trunk, pulled the vertical cardboard away from where it covers the right rear inner wheel well and voila! The problem was obvious. There was a rusted through hole in the top and front of the wheel well. When it rained, the tire threw massive amounts of water up through the hole, directed toward the space behind the rear passenger seat. It sprayed directly into the passenger compartment along the bottom of the seat, 'filled' the rear seat pan, then the overflow ran under the front passenger seat and to the front.

Believe me when I say you could have dry weather for 3-4 weeks and there's enough moisture there to keep your floorboards wet the entire time, keeping you wondering where the water's coming from.

In any event, I'll have a friend of mine hammer a piece of metal to the inner shape above the right rear tire, rivet and seal it in place, and that should take care of the problem.

Hopefully this helps any of you who have a similar moisture problem, but at the least offers a quick way to check to see that the wheel well(s) are not the cause.

Happy motoring
on June 14, 2010
you've provided me more info about what's going on with my car then any dealer or garage i've taken my car to so far! thanks!!
on September 11, 2009
I am afraid the seats and carpet will need to come out again. With more water being in the rear area that would suggest the leak is in the rear. With the seats and carpet out you will need to water test your 1991 Oldsmobile 98 until you find and repair the leak. Sometimes water leaks can be difficult to find, you must continue to water test until you fine the leak. If you take everything apart again and don't find your leak it will just get wet again.
on April 05, 2011
I have 1994 Oldsmobile 98 which had leak. The whole interior pad and carpet was soaked. I pulled up all the carpet and pad, removing the trim as needed. I noticed the front driver side floor where the emergency brake passes through the floorboard had a pool of water after a heavy rain. I noticed the front firewall was soaked, removing padding as needed I finally noticed the top left side where the front and side walls meet the sealant was no longer doing it's job and the water was leaking through there. The location is extremely difficult to get to, to reseal. I had my wife who is small reach in as far as she could using a pressurized re-sealant she took her time a re-seal the entire area. A easy verification for you is to look at the emergency brake area and check for rust. Good luck
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