How do you replace a thermostat in a 2004 Nissan Maxima?

To replace the thermostat in a 2004 Nissan Maxima, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant and remove the upper radiator hose, then unbolt the thermostat housing. Replace the old thermostat with a new one, ensuring the gasket is in place, reassemble the housing, and reconnect the hose. Finally, refill the coolant, bleed the system of air, and reconnect the battery.