Water on floor after heavy rain

2008 MERCEDES BENZ C350

126,000 MILES • 6 CYL • 2WD • AUTOMATIC

NASER NASER

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Had heavy rains today and the passenger side floor was wet and the water would also create a puddle in the back. I replaced the cowl a month ago because water was leaking inside on driver side floor and that solved it.
I gave it to my brother to drive for a week and he told me about the water just now, where could the water be coming from on passenger side? I confirmed with him that it is cold water so from the rain not engine. Thanks

Feb 6, 2020 at 2:47 PM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

Do you have a sun roof? There are drains on both the left and right side. Here are directions for replacing the drain. I'm adding all of it to help locate and inspect.

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2008 Mercedes Benz C 350 (204.056) V6-3.5L (272.961)
AR77.20-P-1997CW Remove/Install Water Drain Rail For Sliding Roof
Vehicle Body and Frame Roof and Associated Components Sunroof / Moonroof Sunroof / Moonroof Drain Service and Repair Removal and Replacement AR77.20-P-1997CW Remove/Install Water Drain Rail For Sliding Roof
AR77.20-P-1997CW REMOVE/INSTALL WATER DRAIN RAIL FOR SLIDING ROOF
AR77.20-P-1997CW Remove/Install Water Drain Rail For Sliding Roof
MODEL 204.0 /2
- with CODE (414) Power glass tilting/sliding roof
MODEL 212
- with CODE (414) Power glass tilting/sliding roof up to model year 2011

pic 1

Shown on model 204.0

1 Water drain rail
2 Tilting bracket
3 Slider

pic 2
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Next, if he was using the defroster or AC, it could be a leak from the evaporator drain. Check under the dash to see if that is where is seems to come from.

Let me know.

Joe

Images (Click to enlarge)

Feb 6, 2020 at 6:15 PM