Was driving my E36 thru very heavy thunderstorm last Saturday. My kid complained that the RH rear carpet (driver side) was soaking wet. Suspect that the water coming thru the air cond duct under the driver seat. The area at the outlet was very wet. I only assuming since this is the first time I face this problem. Have anybody face similar problem? P/S: I have inspect the floor board from under the car, could not find any hole or rust area.