If I recall correctly, you don't have to slip the belt over the fan to get it on and off. In fact, I don't even recall having to take off the fan shroud. It was really easy. Here's the schematic. Good luck.

https://docs.google.com/fileview?id=0B-WRh0Hf7VdZMWEyZDJjNjQtMTkwNC00M2Q3LWJkOTYtMDgxNGFkOTUzMGZi&hl=en

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles