I'm having trouble tracking down a leak in my 400E. After a long drive in the rain a few weeks ago, the driver's side floor mats (front and rear) became SOAKED with water. I pulled them out, dried them out, and left them out in hopes I could more easily see where the water was coming from. The water doesn't get in when the car is just parked. It's rained heavily since then, and the floors remain dry. So I assume it's coming from the road spray while moving. I drove again in the rain this morning, and sure enough, much more water in the floors. Probably half a liter in a 20 minute drive. Where could this be getting in? My sunroof drains are clean and flow normally. My door seals are also fine and show no evidence of leaking. The water must be getting in from somewhere under the car, from road spray. But where? Any similar experiences?

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'85 500SEL, 245,000 miles (sold)
'92 400E, 295,000 miles (donated)
'84 VW GTI (work in progress)
'10 VW GTI (daily)
'72 Chevy C10

Do you by any chance have a rusty 400E?

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Matthew McIvor

2016 E350 4Matic Black/Black
2007 GL450 4Matic with Off-Road Pkg Silver/Black
1995 E300 Diesel White/Gray
1994 S600 Euro Black/ Black Velour
1986 560SL Blue/Blue/Gray
1986 190E Blue/Blue 93k

I don't have that car but that would be a good guess. I would get underneath and inspect with a flashlight. Also if you can pull the carpeting back then you can inspect from inside.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra