Air Cleaner - Thermostatic: Description
All carbureted and throttle body fuel injected models are equipped with an Automatic Temperature Control (ATC) air cleaner assembly. This device maintains temperature of air entering carburetor (or throttle body) within a constant range. This provides leaner air/fuel mixture to reduce harmful exhaust emissions.
In addition, the ATC air cleaner improves engine warm-up characteristics and helps prevent carburetor (or throttle body) icing. The ATC air cleaner assembly consists of an air cleaner housing, vacuum motor, temperature sensor, idle compensator (Sentra models), hot air duct, fresh air duct, and various connecting hoses.