1995 GMC Yukon Owner's Manual - Page 163

Before using your vehicle's air conditioning, open the windows to clear the vehicle of hot air. Using the recirculation function can also help. See "Recirculation Button" in this section for more information. The knob on the left side of the heating system control panel controls the fan speed. The knob has four speed positions. To increase the air flow, move the knob toward HI. To decrease the air flow, move it toward LO. To turn the fan off, move the knob to OFF. If you have the air conditioner on. moving the fan knob toOFF also turns off the A/C compressor. The middle knob on the control panel lets you select the relative temperature of the air flowing into the passenger area of your vehicle. This knob will allow you to adjust the relative air temperature independently of the function knob setting. Move the knob right toward the red area for warmer air. Move the knob left toward the blue area for cooler air. With A/C on, move the knob to MAX for maximum cooling. This setting puts the system in the recirculation mode and helps to maximize your air conditioner's performance and your vehicle's fuel economy. This setting also cools the air the fastest. After the vehicle's interior reaches a comfortable temperature, move the knob clockwise to place the air conditioning system in the normal mode. The right knob on the control panel changes the heatedair conditioning setting. VENT - This setting, with the arrow pointing at the figure's head. directs air through the instrument panel vents. VENT/HEAT - Use this setting, with the arrows pointing at the figure's feet and head, to divide airflow between the heater floor vents and instrument panel vents. HEAT - This setting, with the arrow pointing at the figure's feet, directs air through the heater f o o r vents. This setting is useful for cold weather. HEAT/DEFROST - Use this setting, with the arrow pointing at the figure's feet and the defroster symbol near the figure's head, to divide airflow between the heater floor vents and windshield. DEFROST - This setting with the defrost symbol directs air through the windshield defroster vents. This setting is useful when you have fog or ice on the windshield. The control knobcan be placed in any position between two heatedair conditioning settings to blend the flow of air. The closer the knob is t o a setting symbol, the more the air flow will represent that symbol's air flow arrows. RECIRCULATION BUTTON - This button, between the left and middle knobs, allows the air inside your vehicle to be recirculated. This setting helps to maximize your air conditioner's performance and your vehicle's 3-3