Thermostatic Air Cleaner: Testing

After engine has cooled down, start engine. Check position of air control valve and watch it as engine warms up. It should function as described under "Operation". If not, replace air cleaner snorkel and/or casing.
If equipped with vacuum motor, apply 15 in. Hg to motor (hose disconnected) while engine is cold. Air valve should be up (heat on). If not, or if valve goes down immediately, a vacuum leak or defective motor is indicated. Replace assembly.

Fig 1: Chrysler Corp. Imports Thermostatic Air Cleaner System
Courtesy of CHRYSLER GROUP, LLC