Mode Selection

The mode selection button controls the direction of airflow through the ventilation system.
The airflow outlet is changed as follows:

Refer to the illustration in the Manual Climate Control System section.
Face Level

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

Airflow is directed to the face and floor.
Floor Level

Most of the airflow is directed to the floor, with a small amount directed to the windshield and side window defroster vents.
Floor/Defrost Level

Most of the airflow is directed to the floor and windshield, with a small amount directed to the side window defroster vents.
Defrost Level

Most of the airflow is directed to the windshield, with a small amount directed to the side window defroster vents.
Instrument Panel Vents

The vents can be opened or closed individually using the adjustment ring (if equipped).
You can also adjust the direction of airflow from these vents using the ventilation control lever, as shown in the illustration.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.