Thermostat, Engine Cooling

Valve opening temperature 80 to 84°C (176 to 183°F)
If the valve opening temperature is not within the specified range, replace the thermostat.
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.
Check that the valve is fully closed when the thermostat temperature is below 77°C (171°F). If not fully closed, replace the thermostat.