As assembled by MB, the fan+clutch is held to the water pump using 4 bolts that have a 10mm head. Simplest way to remove them is to use TWO 6-point 10mm box end wrenches. They're available at sears individually for about 3$ each.
Use one to hold the assembly steady while you loosen a different bolt. Once all four bolts have been loosened, go back and remove each one using the open end side of the wrench. If you use the open end of a wrench or a 12pt one, the bolt's head will strip.
-CTH
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