1. Disconnect the ground cable from the battery.
2. Remove the generator. 
3. Drain engine coolant.
4. Disconnect the connectors from the engine coolant temperature sensor.
5. Remove the engine coolant temperature sensor.
FUEL INJECTION (FUEL SYSTEMS)(H4SO) > Engine Coolant Temperature Sensor
1. Disconnect the ground cable from the battery.
2. Remove the generator.
3. Drain engine coolant.
4. Disconnect the connectors from the engine coolant temperature sensor.
5. Remove the engine coolant temperature sensor.