How do you change water pump 1998 Saab 900s turbo?

To change the water pump on a 1998 Saab 900s Turbo, first, disconnect the battery and drain the coolant. Remove the serpentine belt and any components obstructing access to the water pump, such as the timing cover. Once exposed, unbolt the old water pump, clean the mating surface, and install the new pump with a new gasket. Reassemble everything in reverse order, refill the coolant, and check for leaks.