2013 Hyundai Sonata Owner's Manual - Page 169

Features of your vehicle Recirculated air position The indicator light on the button illuminates when the recirculated air position is selected. With the recirculated air position selected, air from the passenger compartment will be drawn through the heating system and heated or cooled according to the function selected. OYF049117 Prolonged operation of the heater in the recirculated air position (without air conditioning selected) may cause fogging of the windshield and side windows and the air within the passenger compartment may become stale. In addition, prolonged operation of the air conditioning with the recirculated air position selected will result in excessively dry air in the passenger compartment. ✽ NOTICE Air intake control This is used to select outside (fresh) air position or recirculated air position. To change the air intake control position, push the control button. Outside (fresh) air position The indicator light on the button will not illuminate when the outside (fresh) air position is selected. With the outside (fresh) air position selected, air enters the vehicle from outside and is heated or cooled according to the function selected. 4 88