Air Cleaner Housing: Description and Operation

Fig. 67 Heated Intake Air System:

The air cleaner is of the conventional paper element carburetor mounted type. The air cleaner includes a valve to regulate the mixture of warm and cold air entering the carburetor. The air valve is operated by a vacuum motor controlled by a bi-metal thermosensor. These components comprise a heated intake air system (TAC) which allows the carburetor to be calibrated leaner than would ordinarily be possible to reduce CO and HC emissions during warm-up, improve cold engine driveability, and reduce carburetor icing.