Replace the fan. There is no good, reliable way to disassemble, repair/lubricate or replace bearings. That item is 13+ years old. You've gotten your money's worth.. The fan is bolted tyo the front of the radiator support. Easy to remove and replace IMHO.
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.