How do you replace thermostat on a 1992 Oldsmobile?

To replace the thermostat on a 1992 Oldsmobile, first ensure the engine is cool, then disconnect the negative battery cable. Drain the coolant from the radiator, and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, take out the old thermostat, and clean the mating surface before installing the new thermostat with a new gasket. Finally, reassemble the housing, reconnect the hose, refill the coolant, and reconnect the battery.