The seatbelt on the passenger side keeps getting wet if it's left parked overnight in the rain. 99 w208 cabrio. Car was off the road over the winter and it didn't do it last year. Are there drain holes that may have become blocked? Maybe the seals somewhere on the passenger side are letting water past? It's not the whole belt, seems to be about 20 inches all inside the trim when the belt is not in use.
Any ideas?
Any ideas?