Re: leaking water from front passenger side, under...
It is either condensation water from the A/C unit that should go out a drain tube to the outside (only if A/C or Defrost is on) or a leaky heater core. If it is a heater core you can usually smell a coolant smell and the water will be warm and your windows will fog up inside. Heater core is more common. Joe ASE Master Tech
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It is located under the passenger side dash behind the glove box. You'll have to lay on your back in the floor board just to see it. unplug the the connector, then remove the 3 screws from around the motor. You'll need to push the bundle of wires that run across it to the side and almost force it out from there. good luck, you almost need three hands
On the early 2000 model Grand Prix the issue with the water leaking into the passenger floor board is usually the seal that has come off near the blower motor, this seal is easily able to be replaced and is inexpensive right from GM. You can remove you wiper blades and the plastic coweling in front of the widshield then look down inside where the intake is for this blower motor and you should see the seal just laying there or maybe hanging off. The purpose of this seal is to divert rain water that runs down the windshield and into this intake area. Replace this seal and it should take care of the issue.
If this isn't the issue some of these cars had an issue with the windshield not having enough adheasive installed on the lower portion of the windshield and allowing rain water to be driven in between the window and the dash, the water then runs down the firewall behind the dash and corrodes wiring. A friend of mine had this issue on his pontiac and had to had the entire ECM wiring replaced and the window resealed.
Is it water or is it engine coolant? Does it smell sweet ... have a color to it ... probably engine coolant. If it is clear water with no smell, it is probably AC condensate. Typically, this is where condensate drips, as the AC is located on the passenger side.
Your AC drain is clogged. If you look near the floor under the dash on the passenger side you will find a small rubber hose that goes thru the floor board. Take the hose off and clean it out. You will find that it is clogged with dirt. Once it is cleaned out hook it back up under the dash. You will notice that if the car is running with the AC on, you will be able to see water dripping on the passenger side under the car that will mean you cleaned the hose out and it is working.
If leaking coolant under dash on passenger side floor broad it's your heater core. Call's for 2.8 labor flat time to remove heater core, in some case's you'll have to recover, evacuate and recharge your A/C system to remove your heater core.Sit under dash on passenger side.
There should be one under hood on passenger side, sticking out of firewall that may be plugged up. Take a piece of coated wire or similar and stick it up in there and see if it's plugged & clean it out, but be careful, don't jamb it too hard & poke a hole in anything like heater core back in there. If it's plugged, it will sometimes back up into interior of vehicle.