How do you change thermostat on 2000 Toyota MR2 Spyder?

To change the thermostat on a 2000 Toyota MR2 Spyder, start by draining the coolant from the radiator. Next, remove the engine cover and disconnect the hoses attached to the thermostat housing. Unscrew the thermostat housing, replace the old thermostat with a new one, and reassemble everything in reverse order. Finally, refill the coolant and check for any leaks.