Chevrolet IMPALA 2005 Owner's Manual page 134

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(Fan): Turn the left knob clockwise or
counterclockwise to increase or decrease the fan speed.
If the airflow seems low when the fan is at the highest
setting, the passenger compartment air filter, if
equipped, may need to be replaced. For more
information, see Passenger Compartment Air Filter on
page 3-25 and Scheduled Maintenance on page 6-4.
:
(Outside Air): Press this button to turn the
outside air mode on. When this mode is on, outside air
will circulate throughout your vehicle. When the
button is pressed, an indicator light in the button will
come on to let you know that it is activated. The outside
air mode can be used with all modes, but it cannot
be used with the recirculation mode.
You may have to set the instrument panel brightness
control to the highest setting during the day to see
the indicator lamp.
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(Recirculation): This mode keeps outside air from
coming in the vehicle. It can be used to prevent outside
air and odors from entering your vehicle or help heat or
cool the air inside your vehicle more quickly. Press this
button to turn the recirculation mode on. When the button
is pressed, an indicator light will come on.
3-22
You may have to set the instrument panel brightness
control to the highest setting during the day to see the
indicator lamp.
The recirculation mode cannot be used with outside
air modes.
D or P (Temperature Control): Slide the levers
marked D (Driver) or P (Passenger) to increase or
decrease the temperature on the driver's side or
the passenger's side of the vehicle.
#
(Air Conditioning): Press this button to turn the
air conditioning system on or off. When A/C is pressed,
an indicator light will come on to let you know that
the air conditioning has been activated.
You may have to set the instrument panel brightness
control to the highest setting during the day to see
the indicator lamp.
On hot days, open the windows to let hot inside air
escape; then close them. This helps to reduce the time
it takes for your vehicle to cool down. It also helps
the system to operate more efficiently.