Hi. I have a 2001 A4, 55k miles. It rained about a week ago, and the floor of the back seat, passenger's side, drew about an inch of water. The windows, sunroof was closed, the seats were dry, as was the rest of the car. I can't figure this out. Any suggestions? Thanks.

 

This has been covered before. If I remember correctly its a blocked drain from the sunroof. The water somehow ends up on the floor. Do a search, you'll get more info on this.

 

Thanks very much