2005 Hyundai Sonata Owner's Manual - Page 114

FEATURES OF YOUR HYUNDAI 1 HEATING CONTROLS B670C02Y-AAT 101 Air Intake Control NOTE: o 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 conditioning with the " " mode selected may result in the air within the passenger compartment becoming excessively dry. o When the ignition switch is turned "ON" the air intake control switch will change to " " mode in floor, floor-defrost and defrost position. This is normal operation. But, the air intake control switch will change to " " mode when the ignition switch is turned "ON" with the MAX A/C mode selected. B690A01O-AAT B690A01NF-A HNF2127-A 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. For normal heating operation, set the air flow control to the floor ( ) position. (The "Fresh" mode will be activated.) For faster heating, the air intake control switch should be set in the recirculate ( ) position. If the windows fog up, set the air flow control to the defrost ( ) position (The A/C will turn on automatically and "Fresh" mode will be activated.) For maximum heat, move the temperature control to "Warm".