How do you change water pump on85 Cadillac Seville?

To change the water pump on an 1985 Cadillac Seville, first disconnect the battery and drain the coolant. Remove the serpentine belt, followed by the water pump pulley and any associated components obstructing access. Unscrew the water pump bolts, remove the old pump, clean the gasket surface, and install the new water pump with a new gasket. Finally, reassemble everything, refill the coolant, and reconnect the battery.