2003 GMC Sonoma Owner's Manual - Page 148

Cooling On hot days, open the windows to let hot inside air escape; then close them. This helps to reduce the time it takes for your vehicle to cool down. It also helps the system to operate more efficiently. A/C (Air Conditioning): Turn the knob to the A/C position to turn the air-conditioning system on or off. When the system is on, this setting cools and dehumidifies the air entering your vehicle and directs it through the floor outlets as well as the instrument panel outlets. MAX A/C (Maximum Air Conditioning): This mode recirculates much of the air inside your vehicle so it cools quickly. It directs most of the air through the instrument panel outlets and a small amount through the floor outlets. to direct half the air to the windshield and half to the floor outlets. Close the center outlets to help defrost the side windows more quickly. In this mode, the system will automatically force outside air into your vehicle and it will also run the air-conditioning compressor, unless it falls below the temperature at which air conditioning is effective. You may notice a slight change in engine performance when the air-conditioning compressor shuts off and turns on again. This is normal. The system is designed to make adjustments to help with fuel economy while still maintaining the selected temperature. For quick cool down on hot days, do the following: 1. Select N C . 2. Select the coolest temperature. 3. Select the highest fan speed. On cool, but sunny days, the sun may warm the upper part of your body, but the lower part may not be warm enough. To remedy this, do the following: 1. Select the bi-level mode. 2. Select the temperature. 3. Select the fan speed. +3(Blend): Use this mode The air-conditioning system removes moisture from the air, so you may sometimes notice a small amount of water dripping underneath your vehicle while idling or after turning off the engine. This is normal. 3-2 1