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look where the wiper are there is a black plastic cover under the wipers ilook under that cover there is one small hole on each side of the front fenders to drain water. those holes may be clogged and the water is run in and down side the heater box next to the blower motor
GM cars used to be notorious for leaking rain water in around the edge of the front windshield. There is also a rainwater drainage system on the front, generally where the wipers are located and the drain hole on the bottom of that can become clogged.
Yup; Go in the engine compartment where the wiper parks on the passenger side, right ahead of the glove box. Pull back the rubber strip that is at the top edge. There is a plastic shield under the wiper and it comes off. Inside you will find the cabin filter. Remove the cabin filter (could use a change) and you will probably find the bottom plugged with leaves and debris. The drain hole is plugged allowing water to accumulate and pour into the passenger side foot well. Clean this out really good and run a snake wire down the drain hole to clear it. Then hose it down to wash the debris out. Make sure you dry your carpets out really good by raising them off the floor board. The under pad once soaked, will stink the car up and rot your floors.
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.
The AC evaporator units have a drain hose that runs through the floor because condensed moisture is a fact of life with AC units. Yours is plugged. You will have to get under the vehicle and look for the hose where it comes out, then take like coat hanger wire and clean it out, It is somewhere in the vicinity of where the passenger foot well meets the fire wall. If you have to raise the vehicle to get under it, make certain you have it safely supported. If you don't have the stuff, drive the passenger side wheels up on a good curb and use some cardboard to slide under.
pull your carpet up near the leak area and look for muddy body seams. it is possible one of the factory body seams are leaking- possibly in the cowl(under wipers) area, especially if it leaks when the car is sitting. there will be dirt/mud around the seams that are leaking. also you can check door seals by running the car on HIGH DEFROST with all doors and windows closed. spray around with a 50/50 soapy water solution. obviously bubbles will form around your leak.
If your car has a sunroof, there are drains from the front corners of the sunroof, and they drain down the sides of the windshield pillars, and then empty out on the ground.
What I would do is open the surnroof, and pour water into the front corners, and then oobserve where the water drains out. If you have a difference in water drainage between the left and the right sides, I would think that you may have loose sunroof drain. They commonly come loose at the sunroof corners. This will allow the water to pass down the windshield pillar, and onto the floor.
Also, I would check the condensate drain tube for blockage. Pull back the carpet, under the glove box, and fins a black hose that pokes thru the firewall. Pull it out, and see if it is blocked internally. If this tube is clogged, water will build up in the heater box, as the black tube is the drain for the heater box.
One of the two above solutions will cure your problem. I see both quite often.
It may be partially plugged up, so whatever can't drain out is ending up in your carpet. This is a rather common problem, so I'm quite confident u need to clean out the hose, u should be able to access it under the dash, passenger side, low on firewall. It can be blown out w/ compressed air, or carefully use a bendable wire to insert and unclog. This problem is made worse by junk (leaves, twigs, pine needles, etc) accumulating in the grill (cowl) in front of the windshield. This is where your fresh air for heat/cooling is drawn in, and the 'junk' eventually plugs up your a/c drain, so keep it clean, u will at least delay it happening again soon. Let me know how u make out.
The motor is located just under the glove box on the passenger side. I remove the glove box then the panel below the glove box. I also go ahead and pull back the carpet and the padding under the motor. It is held in place by 3-4 bolts that take a 7-8 millimeter socket. I use a swivel extension for the back bolts. The motor with the fan blade attached is a tight fit, just keep wiggling and pulling it should come out. Try to remove the old moter without cracking the fan blade, because sometimes the replacement motor doesn't come with a blade