Question about 1990 Pontiac Sunbird

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1900 Pontiac Sunbird is leaking water from outside down behind the dashboard and under the carpet on the driver's & passenger sides of the car. What causes this?

Water seems to be leaking from under the hood into the front of the inside car. We pulled the plastic dashboard out a little and where the foam is on the dashboard water leaks in and goes under the carpet when it rains.

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Well your car is 113 years old it's bound to leak somewhere, I didn't know they made sunbirds in 1900

Posted on Apr 16, 2013


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Posted on Jan 02, 2017

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SOURCE: 1998 Grand Prix Interior Water Leak

yea on bottom rt of ur windshield is what is called the cowl black plastic piece arond the bottom of ur windshield underthat should be weather stripping that may have come off

Posted on Jun 13, 2008

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SOURCE: pontiac grand am leaks water into front floorboard when it rains

On the passenger side, below the heater motor, you will find a rubber water drain hose. The drain is supposed to keep water from building up in the HVAC unit then leaking into the vehicle.
Generally over time, leaves, pine needles and other debris will plug the drain hose allowing the water to back-up in the HVAC unit and end up in the passenger compartment.
You may be able to get to it under the hood or have to crawl under the car to clean it.
Chances are you will find it plugged and causing your leak.
Good luck and let me know.

Posted on Mar 23, 2009

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SOURCE: ar leaks water under the carpet on the passenger

some cars have cabin air filters for the cliamte control system. It would not cause a leak. Look for a grommet loose or a seam leaking. Lift up the carpet and follow the stain to its source.

Posted on Jun 26, 2009

SOURCE: 97 Pontiac Grand Prix Leaks 2

Got a sun roof? Pull down head liner and put drain hose back on.

Posted on Feb 08, 2010

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SOURCE: I have a 2005 Pontiac G6. There is a leak

I had the same problem. This one is a little involved and not for the faint of heart. There is a drain from the sun roof which runs down the passenger side door. There is a rubber gasket just above the vanity mirror that joins a hard metal tube with a flexible plastic tube. Stupid design if you ask me. Anyway, if you remove the screws from the vanity mirror as well as the trim piece that runs down the edge of the door between the windshield and the door, you will probably see a piece of flexible tubing hanging loose. Slide the gasket back together and voila!! No more floods in the passenger seat. Once you have fixed the drain dry out the car with towels and a dehumidifier if possible. Throw a couple boxes of baking soda in (follow directions on box) and you should have a clean dry car in a few hours. I left mine running over night and was dry as a bone and no mold.

Posted on Feb 13, 2010

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My 2006 Camry solara was park outside my house when that morning it was pouring heavily for a Cple of hours. Later on the same day, I was surprise to see water over the surface of the carpet on the front...

It could have leaked in But I think its your heater core.its a tiny radiator behind the dashboard on the passenger side they leak when they go bad.

Aug 30, 2013 | 2000 Toyota Camry

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Why is th carpet wet behind the driver seat in my '02 thunderbird

This can be from one of couple sources. One would be a broken or missing rubber seal in the firewall. Water can and will enter the passenger compartment if the seal is not good or missing. The firewall is the metal between the engine compartment and passenger compartment. There are many penetrations in the firewall for throttle linkage, steering column, electrical harness, etc. All of these penetrations have seals to prevent water from entering. Check to make sure all penetrations have seals. Inspect from under hood and from under the car, too.

Another source is damage to the floor pan. If you went over a rock or jagged object without having enough clearance, it may have punctured or even sliced through the floor - under the carpeting and sound deadening material under it. If you live in a cold area, and the roads are treated with salt or chemicals to melt ice, it may have caused rusting holes to appear in the floor pan. Water spraying up from tires would enter through the puncture or slice and the carpet would wick the water in. It would take a long time to dry and give a musty smell after just a short time. You should inspect the floor pan from underneath the car. Look for punctures, slices and rust / rot. Clean and seal any openings found in the floor pan and firewall.

Fixed windows and glass in the car body are also sources for leaks. The is especially true if glass has recently been replaced. Many times, the back window leaks into the trunk or metal under the rear seat - and flows to the carpeted floor. Look in the trunk at the bottom of the rear window. Side windows can leak, too - so don't forget to look behind trim interior panels on the sides of the back seat. Your leak could be coming from the windshield, too - this will be harder to locate through the dashboard - but you may find water dripping from wires, etc. Look for evidence of water / rust. Clean and reseal body / glass joints when found.

Good luck!

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Hello lwoodzee,

The ECM is under the carpet on the passengers side of the car. See image below and directions for removal.



I hope this helps.



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My car is leaking under the dashboard on the driver's side. The carpet is soaked. We can't seem to find the leak.

Sounds like the pan for the heater core may have been ripped or damaged somehow, or the sealant foam has deteriorated to the point that the carpet gets soaked when the water flows down from the outside vents.

There isn't an easy solution for this problem, unfortunately.

It happens to a lot of older cars that are made by GM, say 1980s or 1990s cars.

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1 Answer

Water leaking into 2005 Camry 6 cyl under carpet drivers side.

I think that I can help you. It sounds like your drain-tube is plugged up. Get in the passenger side, and pull the carpet back from under the glove box. Look for a black rubber pipe that goes from a black box, and pokes thru the firewall, on the passenger side. Remove the hose from the box, and have a container ready to catch water. If water comes out of the black box, your drain hose is plugged up. Clean out the clog, and you will be golden.

Jul 27, 2009 | 2005 Toyota Corolla

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Water on the passenger side floor when it rains

Sounds like the drain for your heater case is blocked, there is a small drain tube on the engine side of the firewall on the passenger side, you can shine a light down there and poke a screw diver in it or just pull the elbow right off and it should take care of it.

May 20, 2009 | 2002 Buick Regal

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Pontiac grand am leaks water into front floorboard when it rains

I had the same problem on my 97 G AM for about a year now, Water getting on the driver side carpet all the way to the back,it just got worst over time, But I found the problem, you have to look behind the wiper motor where the fire wall meets the bodi ,there is a hire line crack rigth behind the wiper motor where the water coming from the wiper cowling drains from ther is some kind of coulking that is painted the same color as the car, you must clean the area with a screwdriver and soap, and use clear silicon with a coulking gun, you must remove the 2 top wiper motor screws do not remove the botom one not need to and remove the 2 wire plugs and pull the motor back and rotaded upwards know youre clear to do the job; good luck it worked for me.

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I turned on the fan inside and closed everything up, went outside and poured soapy water around everywhere. I found bubbles at the mirrors and and the top of the windshield. Also a "Tech" told me that under the door rubber at the driver and passenger sides there is a piece of tape that is supposed to cover two assembly holes on either side but doesn't, so I caulked it and solved the leak that comes out the map lights. I also found that there was a crack in the sealer along the firewall to passenger inside fender allowing water to collect int the wiring channel causing the dreaded "lock" problem, which I had fixed by the dealer but they didn't fix the leak. The dealers and "Jet-set Execs"are the reason GM is hurting as their vans are OK. The fix was spraying RV Roof\Gutter sealant from the front after removing the wiper cover and spraying waaay in. Now I need to fix the one on the front that comes in above the passengers left foot and makes a spiders haven behind the centre cowl. Jim

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