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I have an '08 C63 AMG wagon (W204) and the left rear footwell started getting saturated in the last 2 weeks with the rain, whether I drove it or not. I managed to lift the carpet and dry it all - but there was about 20mm of water under there! I found a cracked and eroded floor grommet so I changed both in that footwell, the issue persisted.
I put some weed trimmer cord down the front drains from the sunroof end and they didn't feel blocked. If they were blocked it'd flood the front footwells anyway, right? Pouring water down the front drains the water dissipates and some water comes out behind the front wheel, seems good.
Tried the rear from the boot but it only goes about 200mm up and gets stuck. I poured water down the rear drain and it did come out the end where it goes behind the bumper but I also spotted it getting wet on the roof liner as I'd pulled the door seal off. It then started to drip from the divider hook hole next to the jesus handle, removed that divider hook hole plastic mold and yep it's wet. I think this is where it must be leaking in the perfect spot to drip directly on the carpet in the footwell below without getting seats or anything else wet! That's why I thought it was leaking from below.
So, how the heck is it leaking there AND draining where it should out the rear? Could the hose have partially come off the nipple - if that's how the drain works? Has anyone struck this? Or able to send me the workshop manual pages so I can see how it all works?
Any help much appreciated. I need the car back on the road and don't want to spend thousands or more taking it to a shop!
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
