Thermostat: Testing and Inspection

2AR-FE COOLING: THERMOSTAT: 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 that the valve of the thermostat opens at the specified temperature.

Standard valve opening temperature:

80 to 84°C (176 to 183°F)

If the valve does not open as specified, replace the thermostat.





(c) Check the valve lift.

Standard valve lift:

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

Text in Illustration





If the valve lift is not as specified, replace the thermostat.

(d) Check that the valve is fully closed when the thermostat is at a low temperature (below 77°C (171°F)).

If the valve is not fully closed, replace the thermostat.