When it rains or snow collects on the car, my 85 300SD collects a BIG amount of water in the area behind the driver's seat on the floor. The passenger side (side of the battery tray) is completely dry. The sun roof seals are dry and need replacing. Could that be where the leak is coming from? I read there are drainage holes around the sunroof and they get plugged...? The car is 80% restored after sitting outside for about 13 years. The engine is a factory replacement, but after purchasing it from a wrecked condition, there were no written records of maintainence. It was like a diamond in the rough and is really turning into quite a beauty of an automobile.
Thanks!
Tom Norris
Diagnosing the leak
Hi Tom, I recommend you remove the rear seat and the rear floor carpets - then use a garden hose and a heavy dose of water to see where the water is leaking in from. Is the rear shelf carpet wet. If so it could be coming through the rear window seal and running down the rear seat panel. Open the sunroof and pour water in the tracks with a gallon jug water should be draining out both the front and back of the roof. You will see it running out under the car onto the ground. Report back your findings. Kent