Black plate (11,1)Cadillac CTS Owner Manual (GMNA-Localizing-MidEast-6882317) - 2014 -CRC - 9/19/13Climate Controls 8-11Operation Tips. Clear away any ice, snow,or leaves from air inlets at thebase of the windshield that couldblock the flow of air into thevehicle.. Keep the path under the frontseats clear of objects to helpcirculate the air inside of thevehicle more effectively.. Use of non-GM approved hooddeflectors can adversely affectthe performance of the system.Check with your dealer beforeadding equipment to the outsideof the vehicle.. Do not attach any devices to theair vent slats. This restrictsairflow and may cause damageto the air vents.MaintenancePassenger CompartmentAir FilterThe filter removes dust, pollen, andother airborne irritants from outsideair that is pulled into the vehicle.The filter should be replaced as partof routine scheduled maintenance.See Maintenance Schedule onpage 11-3.See your dealer regardingreplacement of the filter.ServiceAll vehicles have a label underhoodthat identifies the refrigerant used inthe vehicle. The refrigerant systemshould only be serviced by trainedand certified technicians. The airconditioning evaporator shouldnever be repaired or replaced byone from a salvage vehicle.It should only be replaced by a newevaporator to ensure proper andsafe operation.During service, all refrigerantsshould be reclaimed with properequipment. Venting refrigerantsdirectly to the atmosphere is harmfulto the environment and may alsocreate unsafe conditions based oninhalation, combustion, frostbite,or other health-based concerns.