How do you replace a thermostat in a Honda Passport 2000?

To replace the thermostat in a 2000 Honda Passport, first ensure the engine is cool, then disconnect the negative battery cable. Drain the coolant from the radiator, and remove the upper radiator hose to access the thermostat housing. Unbolt the housing, take out the old thermostat, and place the new one in the same orientation. Reassemble the housing, reconnect the hoses, refill the coolant, and check for leaks before starting the engine.