2003 GMC Sierra 1500 Pickup Owner's Manual - Page 179

Operation Tips Keep the hood and front air inlets free of ice, snow, or any other obstruction (such as leaves). The heater and defroster will work far better, reducing the chance of fogging the inside of your windows. Keep the air path under the front seats clear of objects. This helps airto circulate throughout your vehicle. e Dual Automatic Climate Control System Your vehicle may have the optional dual automatic climate control system. With this system you can control the heating, cooling and ventilation for your vehicle. Adding outside equipment tothe front of your vehicle, such as hood-air deflectors, etc., may affect the performance of the heating and air conditioning system. Check with your dealer before adding equipment to theoutside of your vehicle. If your vehicle is equipped with the dual automatic climate control system, memory seats, and memory mirrors, you can store and recall the climate control settings for temperature, air delivery mode, and fan speed for two different drivers. The personal choice settings recalled are determined by the transmitter used to enter the vehicle. After the button with the unlock symbol on a remote keyless entry transmitter is pressed, the climate control will adjust to the last settings of the identified driver. The settings can also be 3-24