3-9Ventilation Tips Keep the hood and front air inlet free of ice, snow orany other obstruction (such as leaves). The heaterand defroster will work far better, reducing thechance of fogging the inside of your windows. When you enter a vehicle in cold weather, turn thefan knob all the way to the right for a few momentsbefore driving. This helps clear the intake ducts ofsnow and moisture, and reduces the chance offogging the inside of your windows. Keep the air path under the front seats clear ofobjects. This helps air to circulate throughoutyour vehicle. The use of non- GM approved hood air deflectorsmay adversely affect the performance of the heatingand air conditioning system.Audio SystemsYour audio system has been designed to operate easilyand give years of listening pleasure. You will get themost enjoyment out of it if you acquaint yourself with itfirst. Find out what your audio system can do and howto operate all of its controls to be sure you’re getting themost out of the advanced engineering that went into it.Your vehicle has a feature called Retained AccessoryPower (RAP). With RAP, you can play youraudio system even after the ignition is turned off.See “Retained Accessory Power” in the Index.