Kia Optima Hybrid 2017 Owner's Manual page 272

Air intake control
This is used to select the outside
(fresh) air position or recirculated air
position.
To change the air intake control posi‐
tion, push the control button.
Recirculated air position
With the recirculated air
position selected, air from
the passenger compart‐
ment will be drawn
through the heating sys‐
tem and heated or cooled
according to the function
selected.
Outside (fresh) air position
With the outside (fresh)
air position selected, air
enters the vehicle from
outside and is heated or
cooled according to the
function selected.
NOTICE
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 pas‐
senger compartment may become
stale.
In addition, prolonged use of the air
conditioning with the recirculated air
position selected will result in exces‐
sively dry air in the passenger com‐
partment.
WARNING
• Continue using the climate control
system in the recirculated air posi‐
tion may allow humidity to in‐
crease inside the vehicle which
may fog the glass and obscure vis‐
ibility.
• Do not sleep in a vehicle with the
air conditioning or heating system
on. It may cause serious harm or
death due to a drop in the oxygen
level and/or body temperature.
• Continue using the climate control
system in the recirculated air posi‐
tion can cause drowsiness or
sleepiness, and loss of vehicle con‐
trol. Set the air intake control to
the outside (fresh) air position as
much as possible while driving.
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