How to change thermostat in 2001 Oldsmobile silhouette?

To change the thermostat in a 2001 Oldsmobile Silhouette, first ensure the engine is cool and disconnect the negative battery cable. Drain the cooling system by removing the radiator cap and opening the drain valve. Then, locate the thermostat housing, remove the bolts, and take off the housing to access the thermostat. Replace the old thermostat with a new one, ensuring the gasket is properly seated, reassemble the housing, refill the cooling system, and reconnect the battery.