Thermostat: Service and Repair

WATER CONTROL VALVE

Removal and Installation

WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

REMOVAL

CAUTION:
Perform when the engine cold.
1. Drain engine coolant from the radiator. Changing Engine Coolant.
2. Remove the engine room cover using power tool.
3. Remove the air cleaner and air duct assembly. Service and Repair.
4. Remove the upper radiator hose, heater pipe, electric throttle control actuator inlet hose, and heater hose.

NOTE:
Cap or plug opening(s) to prevent fluid from spilling.
5. Remove the engine coolant outlet and gasket.
6. Remove the water control valve, engine coolant outlet and O-ring.

CAUTION:
Discard O-ring, do not reuse.

INSPECTION AFTER REMOVAL

- Place a thread so that it is caught in the valve of the water control valve. Immerse fully in a container filled with water. Heat while stirring.
- The valve opening temperature is the temperature at which the valve opens and the falls from the thread.
- Continue heating. Check the full-open lift amount.

NOTE:
The full-open lift amount standard temperature for the water control valve is the reference value.
- After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.

INSTALLATION
Installation is in the reverse order of removal.

CAUTION:
Discard O-ring, do not reuse.
- Install the engine coolant temperature sensor.
Use Genuine RTV Silicone Sealant or equivalent. Recommended Chemical Products And Sealants.
- Install the water control valve with the whole circumference of the flange part fitting securely inside the rubber ring.
- Install the water control valve with the up-mark facing up and the frame center part facing upwards. The position deviation may be within the range of ±10�.