How do you change a thermostat on a 2002 Pontiac grand am 2.2?

To change the thermostat on a 2002 Pontiac Grand Am with a 2.2L engine, 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 (making sure to orient it correctly), and reassemble the housing and hose. Refill the coolant, reconnect the battery, and check for leaks.