How do you change your thermostat on a 1994 mitsubishi diamante?

To change the thermostat on a 1994 Mitsubishi Diamante, first ensure the engine is cool and disconnect the negative battery terminal. Drain the coolant from the radiator, then remove the upper radiator hose and the thermostat housing to access the thermostat. Replace the old thermostat with a new one, ensuring the rubber gasket is in place, then reassemble the housing and hoses. Finally, refill the coolant, reconnect the battery, and check for leaks.