Mode Selection
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The mode selection button controls the direction of airflow through the ventilation system.
Air can be directed to the floor, instrument panel vents or windshield. Five symbols are used to indicate the airflow positions: Face, Bi-Level, Floor, Floor-Defrost and Defrost.
Face level (B, D, F)

Airflow is directed to the upper body and face. In addition, each vent can be adjusted to direct the air flowing out of the outlet.
Bi-level (B, D, C, E, F)
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Airflow is directed to the face and floor.
Floor Level (A, C, D, E)

Most of the airflow is directed to the floor, with a small amount directed to the windshield, side window defroster and side vents.
Floor and Defrost (A, C, D, E)
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Most of the airflow is directed to the floor and windshield, with a small amount directed to the side window defroster and side vents.
Defrost Level (A, D)

Most of the airflow is directed to the windshield, with a small amount directed to the side vents.
Test yourself
A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.