Take the fan off, blow out all the dirt, and lube it up with a drop or two of light oil. If it was a good quality fan to begin with, it should be fine.
If you need to buy a new one, just conect the power pins...the "tach" pin is not required.
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KachiWachi
Moderator - Wim's BIOS
CPU #1 -
DFI 586IPVG, K6-2/+ 450 (Cyrix MII 433), 128MB EDO. BIOS patched by
Jan Steunebrink.
CPU #2 - Amptron PM-7900 (M520), i200 non-MMX, 128MB EDO
CPU #3 - HP8766C, PIII-667, 768MB SDRAM
CPU #4 - ASUS P3V4X, PIII-733, 256MB SDRAM
CPU #5 - ??? ;)