Chevrolet 2010 Impala Owner's Manual page 163

A. Fan Control
B. Outside Air
C. Temperature Control
D. Recirculation
thumbwheels up or down to increase or decrease
the temperature on the driver or the passenger side
of the vehicle. For single zone, turn the knob clockwise
or counterclockwise to increase or decrease the
temperature.
E. Air Delivery Mode
Control
F. Air Conditioning
G. Rear Window Defogger
For dual zone, turn the
Turn clockwise or counterclockwise
to increase or decrease the fan speed. Positioning the
knob between two modes, can select a combination of
those modes.
If the airflow seems low when the fan is at the highest
setting, the passenger compartment air filter may need
to be replaced. There will be some airflow noticeable
from the various outlets when driving, even with the fan
in the off position. For more information, see
counterclockwise to change the direction of the airflow
inside the vehicle.
and
.
Turn clockwise or
4-17