Thermostat: Testing and Inspection

1UR-FSE COOLING: THERMOSTAT: INSPECTION

1. INSPECT WATER INLET SUB-ASSEMBLY WITH THERMOSTAT

HINT
The water inlet sub-assembly with thermostat is stamped with the valve opening temperature.





(a) Immerse the water inlet sub-assembly with thermostat in water and gradually heat the water.





(b) Check the valve opening temperature.

Standard valve opening temperature:

80 to 84°C (176 to 183°F)

If the valve opening temperature is not within the specified range, replace the water inlet sub-assembly with thermostat.

(c) Check the valve lift.





Standard valve lift:

10.0 mm (0.394 in.) or more at 95°C (203°F)

If the valve lift is not as specified, replace the water inlet sub-assembly with thermostat.

(d) Check that the valve is fully closed when the water inlet sub-assembly with thermostat is at a low temperature (below 77°C (171°F)).

If it is not closed, replace the water inlet sub-assembly with thermostat.