For almost all 1998 to 2006 V6 and V8 engines - Over 120K just replace it before it fails.
This is a common preventative replacement item as these engines age. No instructions are available at this time but there is plentiful information online to guide you in replacement. Consider checking and or replacing the voltage regulator at the same time as it is easier to get the alternator off when the water pump has been removed. The video below will show you how to inspect it by removing the drive belt.
M112 V6 and M113 V8 Water Pump - Easy DIY
$89.00
SKU:
GEG-113WATERPUMP