Guys I've got a 2002 CLK 55 and its leaking water inside on the passenger side floor. Having a look the tray under what looks like the blower unit (which you can unclip and remove) is getting water in it whether its just from washing or in the rain. I assume there must be a blocked duct or something somewhere in the air system which means the water is tracking into there? Where do I start looking? I'm hoping this is a simple and common maintenance thing I need to do. Any help would be much appreciated.