I have fixed a problem like yours on my wife car last spring.
The passenger side get soacked anytime it rains.
To find where the water is entering to the passenger side, you have to remove the carpet where the feet rest, open the hood, look for any passage where the wiring harness from the engine enter the Bulkhead and to the computer under the dash on passenger side.
Sometime it located close to the right windshield wiper arm( passenger side)the plastic cover where the windshield arm is need to be removed to see where the wires enter the bulhead and to the passenger side.
Where the wires enter the bulkead, the seal is made of rubber. That rubber split sometime because of heat and when it rains, the rain get to the passenger side.
Simulate the rain: pour lot of water on the windshield
with carpet removed, look under the dash passenger side, you will see exactly where the water is driping down and going under your carpet.
Tuesday, October 27th, 2009 AT 3:24 PM