Probably every W163 ever made that isn't in the dessert has this problem. The design for the sunroof drainage has a 90 degree bend in it behind the fender with a restricting nipple at the end. You have to go into the fender and splice in a new longer line, pull the grommet and 90 degree bend and put in a longer line with a reduced bend in it. Hoping this fixes the blockage and stops the leak causing both sides of the front seat rugs to be waterlogged every time it rains. The car smells moldy and disgusting. I request that Mercedes not only fire the engineer that designed this but please send us their address so we can send them our used kitty litter.