I have a 300E and I have had the sunroof out a few years ago but I don't recall much about the drain. I would do this: open sun roof and pour water down the drain to see if the leak occurs as a consequence. If so then you can find out what it will take to fix the drain pipe or you can experiment with the hose with a length long enough to bypass the leaky section... assuming pipe is not somehow disconnected near the leak. I would avoid the hose however... after all the car is a Benz/

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Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra