2010 Buick LaCrosse Owner's Manual - Page 216

7-6 Climate Controls 0 (Defrost): Clears the windshield of fog or frost more quickly. Air is directed to the windshield. For best results, clear all snow and ice from windshield before defrosting. # (Air Conditioning): Press to turn the air conditioning system on or off. If the fan is turned off or the outside temperature falls below freezing, the air conditioner will not run. Pressing this button cancels automatic air conditioning and turns off the air conditioner. Press AUTO to return to automatic operation and the air conditioner runs automatically as needed. When the indicator light is on, the air conditioner runs automatically to cool the air inside the vehicle or to dry the air needed to defog the windshield faster. > // (Recirculation/Auto Recirculation): Press to change to automatic control of air recirculation inside the vehicle. When the auto recirculation indicator light is on, the air is automatically recirculated as needed to help quickly cool the air inside the vehicle. In auto recirculation control, the Air Quality Control system may operate when pollution is detected. To adjust the sensitivity of the Air Quality Control, see Climate and Air Quality under Vehicle Personalization on page 4‑38. When the > indicator light is on, air is recirculated inside the vehicle. If both indicator lights are off, outside air will flow into the vehicle. Press AUTO or / to return to automatic operation. Auto Defog: The climate control system may have a sensor to automatically detect high humidity inside the vehicle. When high humidity is detected, the climate control system may adjust to outside air supply and turn on the air conditioner. The fan speed may slightly increase to help prevent fogging. If the climate control system does not detect possible window fogging, it returns to normal operation. To turn Auto Defog off or on, see Climate and Air Quality under Vehicle Personalization on page 4‑38.