1993 GMC Safari Owner's Manual - Page 133

R HTR (Heater): Most of the air comes out near the floor. The rest comes .out from the defroster vents under the windshield and at the front side windows. This is best for cold weather. VENT Theaircomesoutatthevents frontsidewindows.Theairconditioner lever for warmer or cooler air. on yourinstrumentpanelandatyour will notrun.Adjustthetemperature BI-LEV NC: Withthis, outside' aircomes in through the heater floor vent and theinstrumentpanelvents. If youmoveyourtemperaturecontrollever between cold and hot,coolerair will comeoutoftheupperventswhile warmeraircomesoutofthefloorvent.Thissettingisuseful in cool weather with bright sunlight. NORM NC: Thissettingcoolstheoutsideair. If you first used MAX NC, use NORM N as soon asthevehiclehascooleddown, C so outsideair will be going through your vehicle. MAX NC: This cools the air the fastest. Move the other lever all the way to Cold. MAX N lets in only a littleairfromtheoutside. C You canuse MAX A/C atfirstwhenit'sreallyhotoutsideandyouneed to cool off quickly. When the air conditioning or defrostison,youmaynotice ordecrease in enginespeed. a slightincrease Rear Heater Youmay have the optional rear heater. Thethree-speedfanswitch is above theradio.Slide the lever toward HI forwarmerair in thereararea.Movethe switch to OFF to turn the system off. I PO654 3-7