Thermostat Inspection

Immerse the thermostat in water and then gradually heat the water.

Check the valve opening temperature.

Standard valve opening temperature:

80 to 84°C (176 to 183°F)

1. If the valve opening temperature is not within the specified range, replace the thermostat.
   

Check the valve lift.

Standard valve lift:

10 mm (0.39 in.) or more at 95°C (203°F)

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

Check that the valve is fully closed when the thermostat is below 40°C (104°F).

1. If not fully closed, replace the thermostat.