1994 GMC Suburban Owner's Manual - Page 145

The air flow can be blended between the two positions. To blend between positions press the side of the button showing the area where you would like more air flow. The system will automatically begin to blend toward the position chosen. To stop the system between positions, justpress the SAME side of the button again. Right Button Defrost (Top) : This setting operates the defroster. Air comes out near the bottom of the windshield and at your front sidewindows. Use this setting, along with a heat setting, when you get fog or ice on the windshield. Heater (Bottom): Press the bottom of this button and air comes out near the floor. This setting, alongwith a heat setting, is best for passenger comfort in cold weather. The air flow can be blended between the two positions. To blend between positions press the side of the button showing the area where you would like more air flow. The system will automatically begin to blend toward the position chosen. To stop the system between positions, justpress the SAME side of the button again. A/C Button Press the button marked A/C to turn your air conditioneron and off. The A/C symbol will light on your display and air will come out of your instrument panel vents. The fan will automatically be set on LOW . When you press the A/C button to turn the air conditioneroff, the system will operate in the vent mode. When you turn the air conditionerback on, the system will operate in the mode that you last selected unless the OFF button was pressed. MAX Button If you press the MAX button, the air in your vehicle will be recirculated. With the air conditioner on, MAX will give you maximum cooling. It can also be used in all modes to help keep dust out of your vehicle. When MAX is selected,REC will light on your display. If your air conditioner develops high system pressure, it will automatically go into the MAX mode and REC will light on your display. The A/C system will remain in the MAX mode, even if you press the MAX button, until system pressure returns to a normal level. 3-7