SAAB Thermostatic Air Cleaner: Testing

NOTE: Thermostat on Turbo cannot be tested in water since operation temperature is below freezing.

A rough test can be made by removing air intake, and watching valve operation as a cold engine is started and warmed up.
To accurately test sensor, remove entire unit from vehicle and immerse sensor in water. Check to ensure valve is open to fresh air only when water is above 99°F (37°C), and open to heated air when water is below 73°F (23°C).
NOTE: When checking sensor, cable should be in approximately the same position as when it is mounted on engine.

Fig 1: Thermostatic Air Cleaner Sensor Check
Courtesy of SAAB-SCANIA OF AMERICA, INC.

Not applicable to Turbo models.