Auxiliary water pump.... ↗
Owners walk through replacing the X5's electric auxiliary (heater) water pump. Most of the time goes on access: on a V8, take out the left headlight and move the oil-filter canister aside. Then it's two hoses and one connector, plus topping up the coolant you lose. One member found the failing pump was what kept blowing the A/C fuse.
Tools mentioned: Screwdrivers, sockets, coolant to top up
Discussion thread (printable view); steps come from replies.