How do you change the water pump on a 85 Chevrolet celebrity 2.5L engine?

To change the water pump on a 1985 Chevrolet Celebrity with a 2.5L engine, first, disconnect the negative battery cable and drain the coolant from the radiator. Remove the serpentine belt, then detach the water pump by unbolting it from the engine block. Clean the mounting surface, apply a new gasket or silicone sealant as needed, and install the new pump. Finally, reassemble everything, refill the coolant, and reconnect the battery.