Chevrolet 2003 Impala Owner's Manual page 146

If you are in city traffic, your vehicle is stopped and
idling, or the weather is hot, the system may switch from
the outside air mode to the recirculation mode. To
prevent the air inside of your vehicle from becoming too
stale, be sure to return to the outside air mode
periodically.
& I
(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. You may have to set the instrument panel
brightness control to the highest setting during the day
to see the indicator light. The air-conditioning
compressor also comes on. 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
the passenger's side of the vehicle.
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A/C (Air Conditioning): Press this button to turn
the air-conditioning system on or off. When A/C is
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You may have to set the instrument panel brightness
control to the highest setting during the day to see
the indicator light.
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.
For quick cool down on hot days, do the following:
1. Select the vent mode.
2. Select the recirculation mode.
3. Select N C .
4. Select the coolest temperature.
5. Select the highest fan speed.
Using these settings together for long periods of time
may cause the air inside of your vehicle to become too
dry. To prevent this from happening, after the air
inside of your vehicle has cooled, turn the recirculation
mode
oti.
The air-conditioning system removes moisture from the
air, so you may sometimes notice a small amount of
water dripping underneath your vehicle while idling
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