1996 GMC Yukon Owner's Manual - Page 135

Temperature Knob 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 temperatureindependently of the function knob setting. Move the knob clockwise toward the red area for warmer air. Move the knob counterclockwise toward the blue area for coolerair. Rear Air Conditioning and Heating System (Suburban) If your vehicle has either orboth of these systems, you can increase and decrease the airflow at the rear vents. Depending on the system you have and the setting selected, you can send cooled or heated air to the rear of the vehicle. Rear Air Conditioning (Without Rear Heater) I f your vehicle has rear air conditioning (without rear heater), the controls are located above the front and second seats. The front and rear overhead controls let you increase and decrease the airflow at the rear vents. Mode Knob The right knob on the control panel allows you to choose the direction of air delivery. The control knob can be placed in any position between any two mode settings to blend the flow of air. # -0 +e VENT This setting directs air through the instrument panel outlets. + Use this setting to divide airflow VENT/I-IEAT: ' between the floor outletsand instrument panel outlets. To operate the rear air conditioning system,the front air conditioning system must be on. With the front air conditioning system off, the rear system controls can be used to circulate air in the rear of the vehicle. HEATER: This setting directs air through the floor outlets. +HDEFOG: This setting directs air to the heater outlets and toward the windshield. w. DEFROST This setting directs air toward the windshield. 3-3