I have a 2002 Passat and noticed the passenger side back seat floor was soaked a number of times. I pulled the floor pan plug and a ton of water came out. I have heard of the A/C related problem but it was cold when I discovered the water so I wouldn't have been running the A/C. I am looking for other ideas on the problem before I take it to the dealer. I do have a sun roof, thought that might be the origin.