The rear drains are hooked up the sunroof frame at the rear edges and the hoses run down the C-pillars, through the trunk (behind the quarter panel/fender upholstery) and exit the car behind the rear bumper (but that is on the newer models) or behind the rear wheels at the outer sides of the trunk floor (I believe)...

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)