1998 GMC Safari Owner's Manual - Page 157

Rear Air Conditioning System (Option) Air Conditioning Before using your vehicle's air conditioning, open the windows to clear the vehicle hot air. This reduces the of time it takes for your vehicle to cool down. Then keep your windows closedfor the air conditioner to work at its best. You can use MAX A/C with the temperature knob in the blue area when it's really hot outside and you need to cool the insideair quickly. MAX A/C lets in only a little air fromthe outside. If you first use MAX N C , you can then useA/C with the temperatureknob in the bluearea, as soon as the vehicle has cooled down, outside air will be going so through your vehicle. You may have rear air conditioning. The rear air conditioning switchis located to the right of the heater controls. Turn the switch toward HIGH for higher aifflow in the rear area. Turn the switch to the OFF position to turn system off. the 3-5