2012 Buick LaCrosse Owner Manual - Page 266

8-4 Climate Controls Remote Start Climate Control Operation (If Equipped): When the vehicle is started remotely, the climate control system will use the last setting before the vehicle shut off. 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. For vehicles with heated outside rearview mirrors, they turn on when the rear window defogger button is on and help to clear fog or frost from the surface of the mirror. See Heated Mirrors on page 2‑18. Notice: Do not try to clear frost or other material from the inside of the front windshield and rear window with a razor blade or anything else that is sharp. This may damage the rear window defogger grid and affect your radio's ability to pick up stations clearly. The repairs would not be covered by your warranty. 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.