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Air Cleaner - Thermostatic: Testing

NOTE: Thermostat on Turbo cannot be tested in water since the operating temperature of the thermostat is below freezing.
  1. A rough test can be made by removing air intake and watching valve operation as a cold engine is started and warmed up.
  2. To accurately test sensor, remove entire unit from vehicle. Immerse sensor in water. Verify that valve is open to fresh air side when water is above 99°F (37°C), and open to heated air side when water is below 73°F (23°C).
NOTE: When checking sensor, the cable should be in approximately the same position it is when installed on engine.
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