How do you replace a thermostat on 1998 Oldsmobile delta 88?

To replace the thermostat on a 1998 Oldsmobile Delta 88, 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 block. Remove the bolts securing the housing, take out the old thermostat, clean the mating surfaces, and install the new thermostat with the correct orientation. Reassemble the housing, refill the coolant, and reconnect the battery.