Changing the water pump is pretty easy. Just follow the steps on the forum hear. You may want to change the belts while you are there and you will need of BMW coolant. I decided to upgrade my pulleys while I was at it to Turner pulleys. One of my best mods yet, it made a nice performance gain.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software