1994 GMC Suburban Owner's Manual - Page 148

Rear Air Conditioning and Rear Heater If your vehicle has a rear air conditioningand rear heater system combination, controls are provided to regulate the temperature, location and speed of the air flow. Front Control Rear Control ... 1 , To adjust the air temperature, turn the temperature knob on the right side of the control panel. For warmer air, turn the knob to the right (red) side,and for cooler air, turn the knob to the left (blue) side. To regulate the air flow location, adjust the center knob on the control panel. Turn the knob toward the left for floor vent air flow or toward the right for headliner vent air flow. Generally, the upper vents are used for air conditioning and the floor vents for heating: However, the control knob may be set to allow any desired blend of air flow. To adjust the air flow speed, turn the fan control knob on the left side of the control panel to the desired blower setting. To activate the rear control, move the fan knob on the front control to REAR CNTL. This will allow second seat passengers to adjust the controls as they desire. 3-10