Replacing a thermostat on a 95 Subaru legacy?

To replace the thermostat on a 1995 Subaru Legacy, first, ensure the engine is cool and disconnect the negative battery terminal. Drain the coolant, then remove the radiator hose connected to the thermostat housing. Take out the bolts securing the thermostat housing, replace the old thermostat with a new one (ensuring the gasket is in place), and reassemble everything by reversing the steps. Finally, refill the coolant and check for leaks.