Thermostat: Testing and Inspection

^ Suspend the thermostat in a water-filled container using thin wire. Place a thermometer next to the thermostat.
^ Do not directly heat the thermostat.
^ Gradually increase the water temperature. Stir the water so that the entire water is same temperature.
^ Confirm the temperature when the valve first begins to open.
^ Valve opening temperature is 74.5 - 78.5°C (166.1 - 173.3°F).
^ Confirm the temperature when the valve is fully opened.
^ Valve full open at 10 mm (0.39 inch) at temperature 90°C (194°F).
^ Make necessary repair and parts replacement if extreme wear or damage is found during inspection.