Exhaust Emissions System - Thermostatic Air Cleaners: Testing: THERMO-Sensor

Remove air cleaner cover. Place thermometer (thermocouple type) on thermo-sensor. Install air cleaner 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. Thermometer should read 100-111°F (38-44°C). If not, replace thermo-sensor.