I have water leaking aroubnf the heater fan blower into the passenger side of my regal. I have checked both the cabin filter area and see no leaks and also used RTV so better seal around the squirrel cage fan assembly for the heater. This morning I vaumed out about 1/2 gallon of water
I had this same problem. It is caused by water running downe the windshield and into the cabin air filter located under the cowling on the pasenger side. It is really easy to fix.
I've been told all "W" body GM cars have this same filter set up, so all 1997 through 2004 Buick Regals (mine is a 2001) and many other GMs have this problem. MY 2001 Regal would get 1-2 inches of water on the passenger side floorboard after a rain.
There are three things that can be done to prevent this and all three are quite easily accomplished. There is a water diverter weatherstrip above the filter that can become dislodged. Mine was out of place even though the filter had never been changed. I used RTV to glue this weather strip back in place. I also made a cover out of an old plastic 1 gallon antifreeze jug by cutting the ends off and then splitting it down the middle and doubling it to cover the filter but still remain above it so that air is not blocked. This is so that even if the diverter becomes dislodged again this still won't let water get to the filter. Once you pull the coweling, which is very easy to do with one plastic screw like fastener and two plastic "rivets" that you just pull out with needle nose plyers, you'll see what needs to be done. You'll need to use the ignition key to stop the wpers in mid-stroke on the windshield and open the hood to get clearence to the cowling. Speaking of the coweling, lastely I put a bead of RTV between the coweling and the windshield before puting it back on.
So for one tube of RTV, one old plastic jug, one hour of time using a pair of pliars and a knife I have fixed what had been a real PIA water leak. EASY!
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Re: water leak internal on buick regal gs 1998
There is a drain that must be plugged . it drains the condensation from the evaporitor on the AC system. these need to be cleaned once in a while. look from under the car around the firewall . you will see the tube. stick a wire up it to clean it out. and it will dry up. good luck paul
I had the same problem, it happened after changing the cabin air filter. So what I did and it fixed it was to use silicon and where the plastic cover over the air filter attaches there is a rubber gasket that is supposed to seal between the glass and the plastic cover. I carefully used the silicon and sealed all across the top of the plastic cover all the way towards the passenger side of the windshield and that fixed it. It's just a lousy rubber seal and not heater core or anything else, just seal from the center of the windshield all the way to the farthest side of the plastic cover. No problem.
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This usually indicates that the heater core( a thing that looks and acts like a little radiator) has devoloped a leak. Coolant is circulated through thee heater core(located in that area) when you turn on the heater. The core gets hot and a fan blows airthrough it and out into the cabin. A cracked or corroded core will allow coolant to escape into the heater housing and the fan will force it into the cabin. Hope this helps. Dano
I have seen some problems with water coming in through the cabin air filter. (Also known as passenger compartment air filter - see picture) Sometimes this is caused by a buildup of leaves and debris in the cowl area that causes water to overflow into the filter area. Sometimes this is caused by the filter not being installed correctly. I have even seen the water diverter that goes over the top of the filter get discarded by quick-lube "specialists". Anyway, these conditions will allow water to enter into the vehicle through the heater system. Many times I have seen the filter so badly damaged by water and debris that it ends up in the blower motor and stops it from running. This is where I would look for the problem first.
Here' s trick to find water leaks into cabin area,.
Mix a quart of water with a tablespoon of Murphy's Oil Soap (won't harm finish on car) liquid, mixing gently just to mix but not foam.
Start car, and place blower fan on full setting. Close all windows and other openings to try to help increase positive air pressure inside cabin compartment
Get out of car with fan blowing (engine can be running but make sure you don't lock yourself out of car) and gently pour solution on suspected areas. If there's a leak opening, the air from cabin will cause bubbles indicated leak point.
Also raise hood and use solution on fire wall where there are seams and sealant applied. I've seen these be leaks soaking the driver's side floor mats.
If you find a leak, seal it with the best clear silicone caulk, generally about $7 a tube. Clean all areas to be sealed thoroughly of any dirt, oil, grease, or loose rusted metal.
Look under the passenger side of the dash, behind the carpet. Feel the back side of the carpet for dampness. If so, try this: In the same area, look for a black rubber hose that comes from the heater plastic box, and pokes thru the firewall. See if it is plugged up. This is the drain pipe for the AC box, and the cowl panel if the side drains are plugged up. Try that, and please get back to me.
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.
on the outside of the car, on the passenger cowl, there is a black plastic piece that goes from the right side to mid windshield. there are some screw fasteners you can undo with a coin and the other
ones you have to pop the center up before they will release. once you remove it you will see the cabin air filter. first, on my 2000 impala, it never had a cabin air filter installed from the factory, second on the bottom of the plastic cowl piece there should be a cork and rubber piece that diverts the water taken into that area to drain out the right side of the body. when the piece was installed at the factory it was jammed in there and was actually blocking the drain. i wound up replacing the cork and rubber piece myself (with some sheet rubber and stainless steel hardware) and when reinstalling (with a cabin air filter) i made sure it wasn't smushed into the drain. i had water leaks when ever i parked on the side of the road due to the sloping of roads the water would go to the right side. when in my driveway there were no leaks. this problem burned up two blower motors and two fan speed controls (resistors). price both of them!
This sure sounds like the AC condensate drain is plugged, if it is allot of condensation water builds up in the heater/AC case and leaks in on the passenger side, the drain is located on the pass side under the hood down low on the firewall, it is most cases it is a rubber nipple about 1/2 inch in diameter sticking out of the firewall with a little flapper valve in it, stick your finger in it or a stick and see if water drains out.
Check the freon level in the A.C. unit, that's condensation, also you will want to replace the cabin air filter, and clean the drain plug at the bottom of the temperature control unit(big box where the evaporator, heater core, and blower motor are at).