Thermostatic Air Cleaner: Description

Fresh air or heated air is made available to the engine by a system of ducting which directs air into the air cleaner assembly. Air temperature is controlled by a temperature sensitive vacuum system that operates the duct valve. The vacuum-operated duct can select cool air from the outside through a pickup tube, or warm air from a shroud around the exhaust manifold. The system consists of a shroud around the exhaust manifold, an air cleaner assembly with a vacuum motor, a duct and valve assembly, a temperature sensor and on some models a cold-weather modulator.