Clean off the fan clutch threads on the water pump and the nut on the fan and then put anti-seize on them when you reinstall it. Then you can back it off with a good pop with a wrench and something to hold the pulley still next time you have to take it off.

The aluminum water pump pulley upgrade is nearly worth it just because you can wedge a screwdriver in it and get the fan off easily-- with anti seize, potentially without a wench at all. The fan nut isn't on tight because it's left hand threaded, as noted previously.

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2001 E53 3.0 5pd