Immerse the thermostat in water and gradually heat the water.
Check the valve opening temperature.
Valve opening temperature : 85±1.5°C (185±34.7°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 : 8mm(0.3in) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.