Thermostatic Air Cleaner

Check valve shaft and linkage for sticking or wear. Close hood, start engine and allow engine to reach normal operating temperature. Open hood and remove hot air hose. Look into air cleaner and check that air valve is open to allow underhood air to enter air cleaner.

Fig 1: Thermostatic Air Cleaner Assembly (Manual)

Courtesy of FORD MOTOR CO.

Fig 2: Thermostatic Air Cleaner Assembly (Automatic)

Courtesy of FORD MOTOR CO.