2004 Pontiac GTO Owner's Manual - Page 118

>(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. 3-20