How do you change coolant sensor on 2003 Hyundai Santa Fe?

To change the coolant sensor on a 2003 Hyundai Santa Fe, first ensure the engine is cool and disconnect the negative battery terminal. Locate the coolant temperature sensor, usually found near the thermostat housing; unplug the electrical connector and remove the sensor using a socket wrench. Install the new sensor, reconnect the electrical connector, and reattach the battery terminal. Finally, check for leaks and ensure the coolant level is correct.