DC (Fan): Press the D or C buttons to increase ordecrease the fan speed. Pressing either button cancelsautomatic operation and the system goes into manualmode. Press AUTO to return to automatic operation. Theblower may reduce during an Onstar® session to limitbackground noise.If the airflow seems low when the fan speed is at thehighest setting, the passenger compartment airfilter might need to be replaced. For more information,see Passenger Compartment Air Filter on page 3-28 andScheduled Maintenance on page 6-4.# (Air Conditioning): Press this button to overridethe automatic system and turn the air conditioningsystem on or off. When in AUTO, the air conditioningcompressor will come on automatically, as necessary.The air conditioning system removes moisture fromthe air, so a small amount of water might dripunderneath the vehicle while idling or after turning offthe engine. This is normal.M / F (Recirculation/Outside Air): Press thisbutton to switch between recirculation and outside air.Whenever the button is pressed, the indicator light comeson for the mode being used. The recirculation moderecirculates air inside the vehicle. It can be used toprevent outside air and odors from entering the vehicle orto help cool the air inside the vehicle more quickly. Pressthe auto button to have the system select the best airdelivery mode for your temperature setting.Recirculation is not available in the defrost mode andautomatically turns off 10 minutes after defog is selected.This helps to limit window fogging in the vehicle.Using recirculation for long periods of time could causethe air inside the vehicle to become too dry or stuffy. Toprevent this from happening, after the air in the vehiclehas cooled, select outside air or press the auto button.The outside air mode pulls fresh air from outside thevehicle. Outside air is always selected in defrost mode toprevent fogging._ (Heated Windshield Washer, If Equipped): Formore information, see Windshield Washer on page 3-11.3-25
