Wet floor driver's side W126 redux - PeachParts Mercedes-Benz Forum

MS Fowler · #1 03-31-2007, 05:56 PM

I see water on the floor just under the brake pedal after a rain. Car sitting in the driveway--not driven, so it isn't wind-forced into somewhere. I did some investigation today, It has been dry for a week, and there is no water in the car. After each of the following checks, I waited an hour or more before proceeding to the next area, just in case it took that long for the leak to show.

I opened the sunroof, and poured a quart or more of water down each drain at the front. No water on the floor.

I poured another half gallon of water on the driver's side cowl area, at the bottom of the windshield. No water on the floor.

I poured more water in the center of the cowl area, where the W/S/W motor and transmission sit. I even ran a hose into this area, making sure to douse the seals on the W/S/W arms. No water on the floor.

Anyone have any ideas where the water comes in? Is there a "typical" water leak that I haven't investigated?

ggray · #2 03-31-2007, 06:57 PM

Try pouring water on the sunroof... I bet somehow the sunroof drain tube is plugged or has come loose...

Gavin

dpetryk · #3 03-31-2007, 06:58 PM

Check for leaks around where the windshield is bonded to the chassis. Very common area to leak especially if the windshield was not installed properly.

MS Fowler · #4 04-01-2007, 07:27 AM

ggray,
I did pour water into the sunroof drains directly--no leaks, or plugs

dpetryk,
Are you talking about the top side of the windshield? I did not try that. I cannot see how the bottom could be leaking-there is to much bond visible thru the glas, and the water would have to travel uphill. I could imagine that while driving, but not parked. I will try the top and sides of the windshield and report back.

Randy · #5 04-01-2007, 02:25 PM

Isn't there a drain tube for the climate control evaporator condensate, somewhere around the driver's and passenger's footwell, near the trans hump? I can't remember if there is one on each side, but seems like there is. You might check this.

MS Fowler · #6 04-01-2007, 10:13 PM

Randy, that would be a good idea---if the A/C worked ( next project!)

Maybe its fixed. When I first poured water into the sunroof drains, it did not flow on the driver's side. The tube just filled up and stayed full. That is when I ran the old speedometer cable thru it. It was not much of an obstruction--I just hit it with the cable, and whooosh, out went the water. So maybe that was it. I haven't been able to get water to leak into the footwell since, and I really shot some water everywhere with the hose.