How do you replace the coolant temperature sensor on a 2002 Saturn?

To replace the coolant temperature sensor on a 2002 Saturn, first ensure the engine is cool and disconnect the negative battery cable. Locate the sensor, which is typically found near the thermostat housing or on the engine block, and unplug the electrical connector. Remove the old sensor using a socket or wrench and install the new sensor, making sure to torque it to the manufacturer's specifications. Finally, reconnect the electrical connector and the battery cable, and check for leaks after refilling the coolant if necessary.