Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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Thanks Rick. I did check those three drains first since they are the most likely cause of wet floorboards; even though they appeared clear, I went ahead and removed the wheel well liners, washer reservoir, wiper arms, and plastic cowl beneath the windshield for a look. I did not find anything suspect. On your suggestion, I just now removed the dust filter and the panel below the blower. The filter was dirty but completely dry with no indication of previous moisture. The panel below the blower had just a few drops of water, and the lower bearing appears dry and rust-free.
While I was at it, I also checked the two drain holes in the door - both were clear.
It looks like the blower intake is also through the cowl, although rainwater is prevented from entering by the shape of the cowl itself - rainwater is diverted instead to the three aforementioned drains before it has a chance to reach the blower intake. If these three drains clog at their upper inlet, as by leaves accumulating, surely an overflow into the blower intake could result, with attendant saturation of the dust filter. However, that does not appear to be my case. I'm wondering what other avenues might exist for water to reach the floorboard.
- Is it possible for a clogged rear drain to cause it? I'm thinking this is not very likely.
- Is it possible that the drain inlets and tubes are clear, but the joint between the fender and rocker is clogged, causing rainwater to accumulate inside the fender underneath the washer reservoir and somehow find its way inside to the floorboard?
I guess the next step is to remove the seats, console, and carpet to find the source if it continues.