2009 Hyundai Sonata Owner's Manual - Page 112

FEATURES OF YOUR HYUNDAI 1 99 NOTE: o The air intake control switch will change to " " mode when the ignition switch is turned "ON" with the MAX A/ C mode selected. o When you change to another mode from MAX A/C, the A/C and the air intake control switch are set as shown in the following chart. A/C ON ON or OFF * ON or OFF * ON ON * The A/C or the air intake control switch returns to its former setting. Air Intake Control Switch or * B670C03Y-AAT Air Intake Control NOTE: It should be noted that prolonged operation of the heating system in " " 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 " mode conditioning with the " selected may result in the air within the passenger compartment becoming excessively dry. ONF048078 This is used to select fresh outside air or recirculation of inside air. Fresh Recirculation With the " " mode selected, air enters the vehicle from outside and is heated or cooled according to the other functions selected. With the " " mode selected, air from within the passenger compartment is drawn through the heating system and heated or cooled according to the other functions selected.