1. Disconnect the ground cable from the battery.
2. Remove the collector cover.
3. Drain the engine coolant. 
4. Disconnect the harness connector from the engine coolant temperature sensor.
5. Remove the engine coolant temperature sensor.
FUEL INJECTION (FUEL SYSTEMS)(H4DOTC DIESEL) > Engine Coolant Temperature Sensor
1. Disconnect the ground cable from the battery.
2. Remove the collector cover.
3. Drain the engine coolant.
4. Disconnect the harness connector from the engine coolant temperature sensor.
5. Remove the engine coolant temperature sensor.