Guys, Need help. And I have gone through every bit of search and posts before I am requesting this.
My 03 s500 had water all in the driver side on the floor travelling to the rear seat during rain.
I have already checked the cowl on the passenger side. My car is LHD. and I have already cleaned and checked all 4 of the sunroof drains.
there is no blockage there and water is draining through them.
I have also checked the two drains at intersection of driver/ passenger front doors and where the hood meets them. This is to the far right and left of the wind screen locations at the bottom end.

So at this point, even after cleaning all these water is still coming in to the driver side floor and I'm at loss of what other locations I need to check for clogging...

thanks in advance as always.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

Did you take the grid off the top of the wiper duckt ????
Or just pour water in there and it came out /.
Every one i know as had this problem .And there has been a law suit in the usa against mercedes .. There is a call back on the model you have .The reed valve gets stuck closed and it floods the entire car floor pan.Thats why i asked if you had made a good job of cleaning it out .

thanks yes, the reed valve has been taken care of. i cleaned it up thoroughly and water is flowing through it. plus had that been the issue the passenger side would've flooded too. mine is only on the driver side...

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

Benz300 email a friend of mine who fixed the same problem on a '99 SLK230 and '98 CLK320 that I have. You could have gone swimming in the passenger floor on each car. It was a pita, but my friend figured it out on both. His email address is Relux505@gmail.com. His name is Mike. Tell him Dave told you to contact him. Good luck.

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'89 260e (212K Mi.), '92 400e (208K Mi.), '92 400e (not a misprint) (146K Mi.), '95 C220, '81 240D--Sold

I bought a small sink drain unstopper,for my w140 drains. However they can rust out too. I'm going to put in a nylon tube and expoxy it.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran