2002 Buick Rendezvous Owner's Manual - Page 222

Air Conditioning (Defog): This setting directs air to the windshield and through the floor ducts. This mode is particularly useful during cold or inclement weather because of your vehicle's larger windshield area. (Defrost): This setting directs most of the air to the windshield and side window vents. Mode Buttons (Recirculation): Press this button (the light will glow) to recirculate the air inside of your vehicle and to limit the amount of outside air and/or odors entering the vehicle. Press this button again (the light will go off) to send outside air into your vehicle. Using this setting while trying to defrost or defog the windows will help clear the vents of moisture. When the defog, defrost or lower setting is selected, the system will automatically go to outside air mode. Operating the Heating/Ventilation/Air Conditioning (HVAC) system in the recirculation mode may cause fogging of the vehicle's windows when the weather is cold and damp. To clear the fog, switch the HVAC system to either the defog or defrost mode and increase the fan speed. To avoid refogging of the windows, operate the HVAC system in the outside air mode. On very hot days, your vehicle will cool down more quickly and economically if you open the windows long enough to let hot, inside air escape. For all settings, adjust the temperature knob and fan speed as desired. To get maximum cooling or a quick cool-down on very hot days, press the A/C and recirculation buttons (the lights will glow) and turn the temperature knob counterclockwise (toward the blue area). Then, adjust the mode knob to direct the air to the desired location. This setting should not be used for long periods of time because the air may become too cold and dry. Push the A/C button again (the light will go off) to turn off the air conditioning. When the air conditioner compressor is on, you may sometimes notice slight changes in your vehicle's engine performance and power. This is normal. The system is designed to help fuel economy while it maintains the desired cooling level. The air conditioner removes moisture from the air, so you may sometimes notice water dripping from under your vehicle's engine compartment when it is idling or after it has been turned off. This is normal. 3-3