How do you replace the water pump on a 1990 Toyota Corolla?

To replace the water pump on a 1990 Toyota Corolla, start by disconnecting the negative battery terminal and draining the coolant. Remove the serpentine belt, and then take off the timing belt cover and timing belt. Unbolt the water pump, clean the mounting surface, and install the new pump with a new gasket. Reassemble the components in reverse order, refill the coolant, and check for leaks.