Chevrolet 2011 Impala Owner's Manual page 204

8-2 Climate Controls
A. Fan Control
B. Outside Air
C. Temperature Control
D. Recirculation
E. Air Delivery Mode Control
F. Air Conditioning
G. Rear Window Defogger
Single Zone
Temperature Control: For dual
zone, turn the 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.
9
(Fan Control): 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 Passenger Compartment Air
Filter on page 8 5 and Scheduled
Maintenance on page 11 2.
Air Delivery Mode Control: Turn
clockwise or counterclockwise to
change the direction of the airflow
inside the vehicle.