1993 GMC Suburban Owner's Manual - Page 154

Rear Air Conditjoming .and Heating Systems (Wagon Models) . . If.your vehicle has either or both of these systems, you can increase and decrease the air flow at the rear vents. Depending on the system you-have or heatedair to therearof andthesettingselected,youcansendcooled thevehicle. Rear Air Conditkming (Without Rear Heater) . ; p ...,._ . .:< ,...:.:Q::..;:.: If 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 air flow at the rear vents. To operate the rear air conditioning system, the front air conditioning system must be on. Withthefrontairconditioningsystem off, therearsystem controls can be used to circulate air in therearofthevehicle. To operatetherearsystemusingthefrontcontrol,justturntheknob blowerpositionyouwant. to To usetherearcontrol,firstturnthefrontcontrolknob to REAR CNTL. Then,therearcontrolcanbeused to increaseanddecreasetheairflow. 3-8