1995 GMC Safari Owner's Manual - Page 120

Engine Coolant Heater (Option) If you use the optional engine coolant heater before starting your engine, your heating system willproduce warmer air faster to heat thepassenger compartment in cold weather. See "Engine Coolant Heater" inthe Index. Rear Heater (Option) You may have the optional rear heater. The three speed fan switch is above the radio. Slide the lever toward HI for warmer air inthe rear area. Move the switch to OFF to turn the system off. Rear Air Conditioning (Option) You may nave rear air conditioning. The rear air conditioning switch is located above the radio at the top of the instrument panel. Slide thelever toward HI for cooler air in therear area. Slide the lever to OFF to turn the system off. If your vehicle has rear air conditioning, setting it on LO may enhance front A/Cperformance by allowing trapped refrigerant inrear lines to circulate. The systemwill only sendcooled air if the front system is on. It can still be used to circulate air, even if the front system is off. Before using the rear air conditioning, open the windows to clear the vehicle of hot air.Close the windows when using the system. 3-4