How do you change your thermostat in a 2000 Ford Mustang?

To change the thermostat in a 2000 Ford Mustang, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose from the thermostat housing. Unscrew the thermostat housing, replace the old thermostat with a new one, ensuring the gasket is in place, and reassemble everything by reversing the steps. Finally, refill the coolant and check for leaks.