How do you replace the water pump on a 2003 pontiac sunfire?

To replace the water pump on a 2003 Pontiac Sunfire, first disconnect the negative battery cable and drain the coolant. Remove the serpentine belt, then detach the alternator and any other components obstructing access to the water pump. Unbolt the water pump from the engine block, clean the mating surfaces, and install the new pump with a new gasket. Finally, reassemble the components, refill the coolant, and reconnect the battery.