How do you change the water pump on a 1987 Toyota Corolla?

To change the water pump on a 1987 Toyota Corolla, first, drain the coolant and remove any components obstructing access to the pump, such as the timing belt or serpentine belt. Unbolt the water pump from the engine block, clean the mating surfaces, and install a new gasket on the new pump. Attach the new pump, reassemble the belts and any removed components, and refill the cooling system with coolant. Finally, check for leaks and ensure the engine runs smoothly.