Pontiac 2004 GTO - Manual (Page 118)

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(Recirculation): This mode keeps outside air from
coming into the vehicle. It can be used to prevent
outside air and odors from entering your vehicle or to
help heat or cool the air inside your vehicle more quickly.
Move the right dial to this position to turn recirculation
on. Turn the air conditioning on when using recirculation.
Recirculation is not recommended for use over long
periods of time.
Temperature Control: Turn the center dial clockwise
or counterclockwise to increase or decrease the
temperature inside your vehicle.
A/C (Air Conditioning): Press this button on the left
dial to turn the air-conditioning system on or off.
When A/C is pressed, an indicator light in the button will
come on to let you know that air conditioning is
activated.
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 highest fan speed.
3. Select A/C.
4. Select the coolest temperature.
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
or after turning off the engine. This is normal.
Defogging and Defrosting
Fog on the inside of windows is a result of high humidity
(moisture) condensing on the cool window glass. This
can be minimized if the climate control system is
used properly. There are two modes to choose from to
clear fog or frost from your windshield. Use the
defog mode to clear the windows of fog or moisture and
warm the passengers. Use the defrost mode to
remove fog or frost from the windshield more quickly.
Turn the right dial to select the defog or defrost modes.
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