2012 Buick LaCrosse Owner's Manual - Page 260

8-4 Climate Controls If Automatic Operation was set, the fan speed will adjust to maximize heating or cooling. If Manual Operation was set, the fan speed will be limited to the last setting. In extreme temperatures, the system may not be able to heat or cool the vehicle to the preset temperature during the remote start run time. The rear window defogger turns on if it is cold outside. Dual Automatic Climate Control System For vehicles with this system, it controls the heating, cooling, and ventilation. Sensor The solar sensor, located on top of the instrument panel near the windshield, monitors the solar heat. The climate control system uses the sensor information to adjust the temperature, fan speed, recirculation, and air delivery mode for best comfort. Do not cover the sensor; otherwise the automatic climate control system may not work properly. A. Power B. Driver Temperature Control C. Defrost D. Fan Control E. Air Delivery Mode Control F. Recirculation/Automatic Recirculation Non-eAssist Vehicles G. Passenger Temperature Control H. AUTO (Automatic Operation) I. J. L. Rear Window Defogger Heated Steering Wheel ZONE K. Air Conditioning