How do you change a water pump on a 2006 Chevrolet Trailblazer?

To change the water pump on a 2006 Chevrolet Trailblazer, first disconnect the battery and remove the serpentine belt. Next, drain the coolant from the radiator and remove any components obstructing access to the water pump, such as the fan or shroud. Unbolt the old water pump, clean the mounting surface, and install the new pump with a new gasket. Finally, reassemble all components, refill the coolant, and ensure there are no leaks before reconnecting the battery.