How do you replace a thermostat on a 2005 Kia Sedona?

To replace the thermostat on a 2005 Kia Sedona, first ensure the engine is cool, then disconnect the negative battery terminal. Remove the engine cover and locate the thermostat housing, typically near the engine block. Drain the coolant, unbolt the housing, and take out the old thermostat, replacing it with a new one while ensuring the gasket is seated properly. Reassemble everything, refill the coolant, and reconnect the battery.