Is the water pump leaking coolant? If not, then why do you think it's bad?
If the engine is overheating, there are several other things to look at before you consider the replacing the water pump.
Are the fans electric motor driven, or fan belt driven? If fan belt driven, replace the fan clutch. If electric motor driven, check the fan control module and/or fan motors to make sure all is good there. Fan control module tend to fail in weird ways, so if nothing is wrong with the motors, replace the module.
Always, always, replace a thermostat that has overheated. Once overheated, they consistently fail. Make sure you properly refill the radiator with coolant after the stat is changed.
Check that the bottom radiator hose does not collapse.
Check the radiator for corrosion. Boil the radiator out, or have it done, or replace the radiator.
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