Immerse the thermostat in water and gradually heat the water.
Check the valve opening temperature.
Valve opening temperature : 82±2°C (179.6±3.6°F)
Full opening temperature : 95°C (203°F)
If the valve opening temperature is not as specified, replace the thermostat.
Check the valve lift.
Valve lift : 10mm(0.3937in) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.