Thermostat - Operating Temperature Inspection (8-11) Section 8 - Cooling System - Group 08 M11 Page 8-44 Thermostat - Operating Temperature Inspection (8-11) Test Check the temperature marked on the thermostat to see when the thermostat is designed to open. Record the nominal opening temperature. NOTE: Do not allow the thermostat or thermometer to touch the side of the container. Suspend the thermostat and a thermometer in a con- tainer of water. Heat the water. Check the temperature when the ther- mostat starts to open. The thermostat must operate within the following specifications.
Initial Opening Temperature Degree °C Degree °F 81°C MIN 178°F 83°C MAX 182°F Fully Open Temperature 93°C MAX 200°F Maximum Open Distance mm in. 9.52 MAX 0.375 Remove the container from the heat. The thermostat must begin to close as the temperature drops below the nominal temperature marked on the ther- mostat. If the thermostat fails to open at the specified temperature or does not completely close after the water temperature has dropped below the nominal operating temperature, the thermostat must be replaced.