Thermostatic Air Cleaner: Testing: Thermo-Sensor

Remove air cleaner cover and place suitable thermometer (thermocouple type) on thermo-sensor; replace cover. With thermo-sensor cool, start engine and check that hot air control valve is closed to outside air. When valve begins to move, read thermometer; it should read 100-111°F (38-44°C), if not, replace thermo-sensor.