2012 Buick LaCrosse Owner's Manual - Page 259

Climate Controls 8-3 # (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 conditioning system 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. Pressing this button cancels automatic recirculation. Press AUTO to return to automatic operation and recirculation runs automatically as needed. The auto rear defogger turns off automatically after about 10 minutes, or after five minutes if the outside temperature is not as cold. 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 2‑17. 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. 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 was shut off. Rear Window Defogger = (Rear Window Defogger): Press to turn the rear window defogger on or off. The rear window defogger turns off automatically after about 10 minutes. If turned on again it runs for about five minutes before turning off. The defogger can also be turned off by turning the ignition to ACC/ACCESSORY or LOCK/OFF. The rear window defogger can be set to automatic operation. See "Climate and Air Quality" under Vehicle Personalization on page 5‑40. When auto rear defog is selected, the rear window defogger turns on automatically when the interior temperature is cold and the outside temperature is about 4°C (40°F) and below. > (Recirculation): Press to alternate between recirculating air inside the vehicle or pulling in outside air. When the indicator light is on, air is being recirculated inside the vehicle. This helps to quickly cool the air inside the vehicle or prevent outside air and odors from entering.