How to change thermostat in Saturn sl2?

To change the thermostat in a Saturn SL2, start by draining the coolant from the radiator. Next, remove the thermostat housing, which is typically secured by bolts, and take out the old thermostat. Clean the mating surfaces, install the new thermostat in the correct orientation, and reattach the housing. Finally, refill the cooling system with coolant and check for leaks.