Recirculation Mode Inside Air Vent
The outside (fresh) air position is selected automatically when the sunroof is open.
When you select the recirculation position, the system maintains the recirculation mode for 3 minutes, then automatically switches to the outside (fresh) air position.
When the sunroof is closed, the air intake position will return to the previously selected position.
WARNING! Limited Visibility
Continued use of the climate control system in the recirculation position may increase humidity inside the vehicle, which may cause the windows to fog up and reduce visibility.
WARNING: Sleeping with the Air Conditioner On
Do not sleep in the vehicle with the air conditioner or heater on, as this may cause serious injury or death due to a drop in oxygen level and/or body temperature.
WARNING - Recirculated Air
Continued use of the climate control system in the recirculation position may cause drowsiness, and loss of vehicle control. Set the intake control to the outside (fresh) air position as much as possible while driving.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.