Why is water accumulating on the floor behind the driver seat? on 2003 Mercedes-Benz CL500

At first I thought a valet left the rear window open, I brought the vehicle for repairs, the carpets were removed and dried and all the electrical was replaced (apparently the majority of it runs underneath the back seat). Yesterday I noticed water had accumulated again.

by in Ossining, NY on July 24, 2013
2 answers 4 comments
ANSWER by on July 25, 2013
poss heater core is leaking and running back there under the carpet. are you adding water to the cooling system?
COMMENT by on July 25, 2013
No
COMMENT by on July 25, 2013
poss window or door seal leaking?
COMMENT by on July 25, 2013
No, there's no moisture anywhere except the floor.
ANSWER by on July 25, 2013
No water in front pass side? Sun roof? Only after rain or car wash?
COMMENT by on July 25, 2013
No, only the back on the floor. However the car was washed at the dealership the day before. Is it possible water is not draining properly and accumulating only in that area?

Related Content