Thermostat: Testing and Inspection

1NZ-FXE COOLING: THERMOSTAT: INSPECTION

INSPECTION

1. INSPECT THERMOSTAT




HINT: The valve opening temperature is inscribed on the thermostat.





(a) Immerse the thermostat in water and then gradually heat the water.
(b) Check the valve opening temperature of the thermostat.
Standard valve opening temperature:
80 to 84°C (176 to 183°F)
If the valve opening temperature is not as specified, replace the thermostat.





(c) Check the valve lift.
Standard valve lift:
8.5 mm (0.338 in.) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.
(d) Check that the valve is fully closed when the thermostat temperature is below 77°C (171°F).
If not fully closed, replace the thermostat.