How do you replace water pump in a 2004 Buick century?

To replace the water pump in a 2004 Buick Century, start by disconnecting the battery and draining the coolant from the radiator. Remove the serpentine belt and any components obstructing access to the water pump, such as the alternator or engine cover. Once exposed, unbolt the water pump, clean the gasket surface, and install the new pump with a new gasket. Reassemble everything, refill the coolant, and reconnect the battery.