Oldsmobile 2001 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
operate the HVAC system in the outside air mode.
-
fogging of the windows,
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.
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