Grand prix front passenger floorboard gets wet

you could use silicon spray or sealant but that is a cheap, messy fix, get the seals replaced. the switch issue is probably down to water damage and corrosion, replace the switch

Possible blend door

Check A/c drain clogged, back side globe box.

Hi,

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2002 Pontiac Grand Prix Door Panel

All the best,

Ben

your air conditioning drain is probably stopped up.the drain is located on the passenger side along the firewall.

http://www.summitracing.com/search/Year/1999/Make/PONTIAC/Model/GRAND-PRIX/Department/Interior-Accessories/Part-Type/Window-Regulators/Window-Regulator-Position/Passenger-side-front/?Ns=Rank%7cAsc

look directly behind the front wheel, on what is called the pinch weld. there should be a notch cut out for this purpose.

the water could have just traveled. check the heater core.it might be bad.

could be that when it rains or is wet out that water is leaking into your car under the hood under the vent by the windshield wipers on the passenger side and instead of being filtered out its going into the car on the passenger side floor. (check to see if this is wet after a heavy rainfall) and causing a short and rusting it out. this happened with my 2002 grand prix just this year. I got a water resistor for like $3.50 from a local pontiac dealership/parts store and put it in. Its easy to install and it poured out today and my car didnt leak at all.

Grand Prix has problem with resistors module, replace it, will fix problem 99%