How to change the thermostat in a 2003 Oldsmobile silhouette?

To change the thermostat in a 2003 Oldsmobile Silhouette, first ensure the engine is cool, then disconnect the battery. Remove the upper radiator hose from the thermostat housing and take off the housing itself by unscrewing the bolts. Replace the old thermostat with a new one, ensuring the gasket is properly seated, reattach the housing, and reconnect the radiator hose. Finally, refill the coolant and reconnect the battery before starting the engine to check for leaks.