How do you replace the thermostat on a 2003 madza mpv?

To replace the thermostat on a 2003 Mazda MPV, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the hoses connected to the thermostat housing. Unbolt the thermostat housing to access the thermostat, replace it with a new unit, and reassemble everything, ensuring to fill the cooling system with the appropriate coolant afterward. Finally, reconnect the battery and check for leaks.