Question about 2000 Buick Regal

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Have a leak under passenger side dash when it rains. I think the door under the cabin air filter isnt closing is it an easy fix

I have a leak coming from underneath the dash on a 2000 buick regal when it rains.. I think the door underneath the cabin air filter isnt closing. Is this an easy fix

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  • jlskerrett May 18, 2009

    Yeah I already tried that but it wasnt clogged up, and it only drips water from underneath the passenger side dash when it rains the harder it rains the more water gets in the floorboard..

  • stephen gosser May 11, 2010

    water shouldn't be coming in contact with that door check to make sure there arnt leaves on the other side of the cabin air filter

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Having just repaired this problem in a 1998 Buick Regal, I can tell you that fixing the water leak is actually quite easy. It took me quite a while to track down the source of water, but I have discovered that it comes through the cabin air filter. There is a seal on the passenger side of the cowl (A two piece unit, black plastic, against the windshield) that seals it to the windshield to prevent water infiltration. It is very small and somewhat hard to miss. I took the cowl off to change the filter when I discovered this.

You can make a diverter to go over the air filter under the cowl, or even easier is to use some clear RTV silicone (avalible at any automotive and most hardware stores) and put a good bead on the old seal. When you re-install the plastic cowl, be carefull where it goes against the windshield to make sure you don't "smear" the silicone. After you re-install the plastic retainer hardware, smooth out the bead and clean up the excess silicone(a wet finger and some old cardboard works great). Let it dry and clean up the water in the passenger compartment.

Cleaning up the water is the hard part. Removing the plastic trim around the door (if you grasp the trip peices firmly they just pull up off some metal clips,but they can be quite stubborn) you will notice the carpet just pulls up. At the bottom front corner of the front doors the carpet has a plastic hook that is around one of the trim clips. Lift it off that and the rest of the carpet towards the firewall just pulls up. If it has been a long problem, your carpet may be moldy. Also, the carpet edges and some of the more hidden panel clips are very sharp and may cut you while you are poking around, so be carefull.

Since the water entered through the air filter and right over the fan, you will at minimum want to replace the filter. I had mold and moss growing on mine. My fan also squeels and chirps now, so I know it got wet. Not much to do about that but replace it or carefully lubricate the motor.

In your question you mentioned a door underneath the filter not closing. On my '98 Buick Regal there is no door or valve of any sort. The filter sits right above the fan blades. It is the cowel's job to prevent water from entering this part of the vehicle. I hope this helps you fix your problem.

Posted on Jun 22, 2009

  • Russkerr Sep 16, 2010

    This article was bang on. I have just recently been having problems with my 98 Buick Regal GS. My heater/AC fan quit. Through trial and error I discovered it was the Controller unit which holds the resistor pack. Purely by accident I was driving from the auto parts store in the rain with my new part not yet installed and noticed that water was pouring out of the heater box. I realized quickly why the controller was defective. It would have been right in the waters path. After reading this article I took the cowl apart and looked at my cabin air filter and it has obviously been leaking for a long time. It was soaked and growing stuff. I took your advice and replaced the filter and siliconed the seal around the cowl and and all is working great. Thanks for the advice. You saved me a lot of investigative work. Hours of searching turned in to a 20 minute repair. Very much appreciated. Russkerr

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Water on the inside passenger side floor comes from the heater intake box. There is a drain for it that gets plugged r sticks in the closed position. The drain for the box is located in the engine compartment passenger side on the fire wall. It looks like a 1" diameter nipple sticking out about 2" from the fire wall near the power steering pump. Reach down and squeze the end of it to free up the valve at the end.

Posted on May 17, 2009

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This is a good tip; I also found that the source of the leak was water entering via the cabin air filter. But - at least in my case - the problem was the weather strip that attaches to the car frame below the window and above the cabin air filter. his piece of weather stripping is intended to redirect water that runs off the windshield to either side of the cabin air filter, into the windshield drain pan, then onto the ground. Mine was partly detached and it appeared that it no longer held the frame tightly enough to prevent water from running onto the cabin air filter and then leaking onto the floor on the passenger side of the cabin.

To correct the problem I removed the weather strip, cleaned it and filled the slot that attached to the frame with silicone adhesive/sealant. After reattaching the weather strip, I added a bead of silicone between the strip and the car frame for good measure.

I don't doubt that sealing the cowl to the windshield would also redirect the water, but that would make replacing the filter more difficult. It appears that the rubber strip on the back of the cowl is intended to minimize vibration noise, not to seal out water.
Have a leak under passenger side dash when it rain - 4392a29f-d079-4714-91dc-b855269cd063.jpg

Posted on Nov 29, 2013

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Its most likly your gasket under your window

Posted on May 29, 2009

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