The coolant temperature sensor on a 1999 Honda CR-V is located on the driver's side of the engine block, just below the thermostat housing. It is a single wire sensor with a green connector.
Steps to Replace the Coolant Temperature Sensor
1. Remove the negative battery cable.
2. Drain the coolant from the radiator.
3. Remove the thermostat housing.
4. Remove the coolant temperature sensor.
5. Install the new coolant temperature sensor.
6. Reinstall the thermostat housing.
7. Refill the cooling system with coolant.
8. Reconnect the negative battery cable.
Tips
* Make sure that the new coolant temperature sensor is properly seated in the thermostat housing before tightening it down.
* If you have any questions about how to replace the coolant temperature sensor, please consult a qualified mechanic.
