1999 GMC Sierra 1500 Pickup Owner's Manual - Page 167

Right Button Defrost(Top): Presshere to operatethedefroster.Heatedaircomesout nearthewindshield. You canuse it to helpclear fog or iceonyour windshield. Heater (Bottom): Presshere,andheatedaircomesoutnearthefloor.This setting is bestforpassengercomfort in cold weather. Theairflowcanbeblendedbetweenthetwopositions. To blendbetween positions,presstheside of thebuttonshowingtheareawhereyouwouldlike moreairflow.Thesystemwillautomaticallybegin to blendtowardtheposition SAME side of chosen. To stopthesystembetweenpositions,justpressthe thebuttonagain. Left Button Vent(Top): Pressthetop of thisbuttonand all of theairflowwillcome throughtheinstrumentpanelvents. Heater (Bottom): Pressthebottom comethroughtheflooroutlet. of thisbuttonand all of theairflowwill To blendbetween Theairflowcanbeblendedbetweenthetwopositions. whereyouwouldlike positions,presstheside of theswitchshowingthearea more air flow.Thesystemwillautomaticallybegin to blendtowardtheposition SAME side of chosen. To stopthesystembetweenpositions,justpressthe thebuttonagain. Temperature Selector Bar The bar under your system display lets you select the temperature of the air COLD for cooler air and press HOT for comingintoyourvehicle.Press warmerair.Release thebar when thesystemreachesthetemperatureyou want.Thetemperature is shownonthedisplaybyanarrowmovingbetween C and H. Fan Control Button This button is in the upperrightcorner ofyoursystemcontrolpanel.Thefan low, mediumhighandhigh.Pressthetop of hasfour settings-low,medium of the button (-) to thebutton (t)to increasetheairflow.Pressthebottom decrease the air flow. The setting you select is shown on your display as LOW, MED LOW, MED HI or HI. Air Recirculation Button Ifyoupressthe MAX button (RECIR onsomemodels),theairinyour vehiclewillberecirculated.Withtheairconditioner on, MAX will giveyou maximumcooling. It canalsobeused in all modes to helpkeepdustoutof yourvehicle.When MAX is selected, REC will light onyourdisplay. 3-7