Thermostat: Testing and Inspection

INSPECTION





1. INSPECT THERMOSTAT

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





a. Immerse the thermostat in water and gradually heat the water.
b. Check the valve opening temperature.
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.
Valve lift: 10 mm (0.39 inch) 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 is at low temperature (below 40°C (104°F)).
If not closed, replace the thermostat.