1995 GMC Yukon Owner's Manual - Page 162

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 coolerair. The right knob on the control panel changes the heater 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 floor 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 knob can be placed in any position between two heater 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 airflow arrows. Heater/Air Conditioning Controls If your vehicle has air conditioning, your heater/air conditioning controls will look like this. 3-2