2001 Oldsmobile Silhouette Owner's Manual - Page 206

(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 (Outside Air): Press this button to send outside air into your vehicle. The light in the button will glow when outside air is in use. Using this setting while trying to defrost or defog the windows will help clear the vents of moisture. While floor, defog or defrost mode is selected, the system will automatically go to outside air mode. (Recirculation): Press this button to limit the amount of outside air entering your vehicle. The light in the button will glow when recirculation is in use. You may use this setting to limit odors entering your vehicle. 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 re-fogging of the windows, operate the HVAC system in the outside air mode. A/C (Air Conditioning): Press this button to turn the air conditioning compressor on and off. The light in the button will glow when the air conditioning is in use. Air Conditioning with Dual Temperature Control (Option) Fan Knob The left knob is the fan knob and is used to select the force of air you want. Turn the knob clockwise to increase fan speed and counterclockwise to decrease fan speed. The fan must be turned on for the air conditioning compressor to operate. 3-3