How do you replace the thermostat on a 2000 Oldsmobile silhouette?

To replace the thermostat on a 2000 Oldsmobile Silhouette, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator and remove the upper radiator hose connected to the thermostat housing. Unscrew the thermostat housing, take out the old thermostat, and clean the mating surfaces. Install the new thermostat, reattach the housing and hose, refill the coolant, and reconnect the battery.