2005 GMC Canyon Owner's Manual - Page 146

Fan Knob 9 (Fan): The center knob on the control panel is used to control the fan speed. Turn the knob clockwise or counterclockwise to increase or decrease the fan speed. If the knob is set on "0" (zero), some outside air will still enter the vehicle and will be directed according to the position of the mode knob. Mode Buttons @ (Recirculation): Mode Knob The right knob on the control panel is used to direct the airflow inside your vehicle. Turn the knob to select one of the following modes: If your vehicle has air conditioning, you will have the recirculation feature. This mode recirculates air inside the cabin, and prevents outside air from coming in the vehicle. It can be used to prevent outside odors from entering your vehicle and cool the air inside your vehicle more quickly. Press this button to turn the recirculation mode on or off. An indicator light on the button will come on to let you know the recirculation mode is activated. Recirculation is available in the bi-level, vent and floor (heat) modes. It should only be used while in bi-level and vent modes. Recirculation is not available, and the light will not come on, while in floor/defog or defrost modes. H (Vent): Select this mode to direct air to the instrument panel outlets. Select this mode to direct approximately half of the air to the instrument panel outlets, and the remaining air to the floor outlets and the defroster and side window outlets. Cooler air is directed to the upper outlets and warmer air to the floor outlets. Select this mode to direct air to the floor outlets. Enabling recirculation in heat mode may cause interior window fogging under some conditions. If this occurs, see "Defogging and Defrosting" following. \(Bi-Level): #(Air Conditioning): [ (Floor): Your vehicle may have air conditioning. Press this button to turn the air-conditioning system on or off. An indicator light on the button will come on to let you know the air conditioning is activated. When the system is on, this setting cools and dehumidifies the air entering your vehicle. The air conditioning will not function if the fan is turned off. You may notice a slight change in engine performance when the air conditioning compressor shuts off and turns on again. This is normal. The system is designed 3-20