2008 Hyundai Sonata Owner's Manual - Page 125

FEATURES OF YOUR HYUNDAI 1 111 B670C03Y-AAT Air Intake Control Switch FRESH MODE ( ) : The indicator light on the button goes on when the air intake control is in fresh mode. RECIRCULATION MODE ( ) : The indicator light on the button is illuminated when the air intake control is in recirculation mode. With the "Fresh" mode selected, air enters the vehicle from the outside and is heated or cooled according to the function selected. With the "Recirculation" mode selected, air from within the passenger compartment will be drawn through the heating system and heated or cooled according to the function selected. HNF2139 NOTE: It should be noted that prolonged operation of the heating system in "recirculation" mode will give rise to fogging of the windshield and side windows and the air within the passenger compartment will become stale. In addition, prolonged use of the air conditioning with the "Recirculation" mode selected may result in the air within the passenger compartment becoming excessively dry. This is used to select fresh outside air or recirculation of inside air. To change the air intake control mode (Fresh mode, Recirculation mode), push the control button.