1999 GMC Sierra 1500 Pickup Owner's Manual - Page 166

Comfort Controls & Audio Systems Whenyoufirstturnonyourvehicle'sairconditioning,openthewindowsto clearthevehicleofhotair. K2313 Yoursystemhas alighteddisplayshowingeachsystemwhen it isoperating. Duringnormaloperation,allthelightswon'tcomeonatthesametime.Only theonesdisplayingthecurrentsettingswilllight. System Controls N Button:Pressthebuttonmarked C N toturnyourairconditioneronand C off. The N symbolwilllightonyourdisplayandairwillcomeoutofyour C LOW. dashboardvents.Thefanwillautomaticallybeseton When you press the N button to turn the air conditioner off, thesystemwill C operate in theventmode.Whenyouturntheairconditionerbackon,the OFF button systemwilloperate in themodethatyoulastselectedunlessthe waspressed. OFF Button:Pressthisbuttontoturntheairconditioninglheatingsystem Pressing OFF willerasethepresentmodeofoperationfromthesystem's memory.Outside air will still come out of theheateroutletwheneverthe vehicleismovingforward. off. If the OFF button waspressed,youmustpress N C , MAX (RECIR onsome models),oroneof the BLEND buttons for the system to comebackon. Air Controls (BLEND) The two buttons to the right ofthesystemdisplaycontroltheair flow. You can blend the air flow to suit your needs.Theamountofblendingisshown onthedisplaybyanarrowmovingbetweenthefigure'sfeet(floorairflow) andhead(ventairflow). 3-6