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You have to remove the sunvisors and rain sensor cover & the side trims + upper plastic roof trim there are hidden screws behind the rubber trim on the top section and 4 screws beneath the interior upper plastic section thats why you need to remove the sunvisors etc, it will lift off reasonably easy once all the screws are removed be careful with the plastic pieces I did this job last week takes about 45 mins to remove
i had this same thing happen to me. this may or may not be your problem. outside at the very bottom of your windshield there should be a grate, that will come off. under that is a ruubber type gasget that sometimes is not in the right position and the water drips inside your car. i had a wind-shield replaced and the tech did not put the rubber gasget back in it's proper place. it was like a 10 min fix and it never leaked again, amazing
They are glued in with Urethane adhesive sealant and must be cut out. There are special tools for cutting it. You can use an "L" shaped knife with a cable to pull it or something like a piano wire to saw through it. You will need some help from a good friend. Be sure to treat all the metal and glass that will be exposed to the urethane window weld with a special primer that is made for that purpose.
We have the SAME problem. Where it is coming from is PONtiacs great job of engineering
If you remove the Plastic cowel Trim piece that is at the Bottom of the Winshield. from to do this lift the hood and take off the black platic part that is sealed against the windshield from outside. You will see that water runs down the windshield, under this trim part and drops DIRECTLY into the OPEN top of the fan/heater box. the only protection is a Cabin air filter that looks like a flat air clearner.
The water runs thru the heater box and drips from the fan motor.
I built a small mudflap shield under this trim o part to rout the water away from a direct drop onto the Floorboards. What a P.O.S. design. easy fix would have cost PONTIAC about $2 to design something to prevent this
It is underneath the black plastic pieces under/below the wipers. There are just a few round fasteners that hold down the passenger side piece that need to be removed to access the filter. You have to remove the windshield wiper arms, then take off the plastic molding that lies between your windshield. Once that is off (it comes out in two pieces) on the passenger side of the car, under the windshield just behind the firewall there is a plastic rain shield with two screws. Remove the rain shield. The cabin filter is under that rain shield. FYI...every bolt is metric, and be careful when removing the plastic molding-only turn those screws a half turn, they break very easily!