My '85 300D did suffer a soaked left rear floor flood due to a failed condensate drain on a journey when the humidity was relatively high and the a/c ran for hours on end. The water ran down the transmission tunnel, under the driver's floor pad, and pooled in the left rear footwell. We finished the trip with the floor pad removed and a sponge for occasional bailing. Once home, the forum helped diagnose the problem and I made the fix.

In the current situation, the cause could be one of the other possibilities already mentioned by other posters. One test that could be done is to wash the car on a flat surface or, if that is not possible, with the car reversed in the driveway so it points down, not up.

The various drains should be checked regularly as part of normal maintenance, especially if the car is parked outside and subject to falling leaves and other debris. Even a garaged car will pick up a surprising amount of crud in the drains, however, and I check mine every few months.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970