Air Cleaner - Thermostatic: Description

Fresh air or heated air is made available to the engine by a system of ducting which directs air into air cleaner assembly. Air temperature is controlled by a temperature-sensitive vacuum system that operates duct valve.

The vacuum-operated duct can select cool air from outside through a pickup tube, or warm air from a shroud around the exhaust manifold. The system consists of the shroud, an air cleaner assembly with a vacuum motor, a duct and valve assembly, a temperature sensor, and a cold-weather modulator (some models). See Figure .