How do you change the thermostat on a 1998 Oldsmobile silhouette?

To change the thermostat on a 1998 Oldsmobile Silhouette, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then locate the thermostat housing, which is typically near the engine's water outlet. Remove the housing by unscrewing the bolts, take out the old thermostat, and clean the mating surfaces. Install the new thermostat, reattach the housing, refill the coolant, and reconnect the battery.