Thermostat: Testing and Inspection

INSPECT THERMOSTAT

HINT: The thermostat is numbered with the valve opening temperature.

(a) Immerse the thermostat in water and gradually heat the water.
(b) Check the valve opening temperature.

Valve opening temperature: 80 - 84°C (176 - 183°F)

- If the valve opening temperature is not as specified, replace the thermostat.





(c) Check the valve lift.

Valve lift: 8 mm (0.31 in.) or more at 95°C (203°F)

- If the valve lift is less than specification, replace the thermostat.