2014 Buick LaCrosse Owner Manual - Page 174

8-4 Climate Controls Pressing the 0 button during an auto stop may restart the engine to prevent window fogging. To reach comfort levels quickly during an auto stop, the engine will restart if the air conditioner is off and AUTO or A/C is selected. If temperature controls are adjusted cooler by more than 1°C (1°F) during an auto stop, the engine will restart to ensure that comfort is reached. The Air Quality Sensor may operate the recirculation mode automatically. See "Climate and Air Quality" under Vehicle Personalization on page 5-43. 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. For eAssist vehicles, there may be shorter and less frequent auto stops when auto defog is in use. To turn Auto Defog off or on, see "Climate and Air Quality" under Vehicle Personalization on page 5-43. For eAssist vehicles, an auto stop may occur if the climate control system determines the a/c compressor can be shut off and still maintain comfort levels with minimal windshield fogging. Eco A/C (For eAssist Vehicles): Press to cycle between the off, eco and comfort air conditioning modes. The indicator will be lit green in eco, amber in comfort, and turns off when there is no A/C function. If the fan is turned off the A/C will not run. The eco A/C setting balances fuel economy and air conditioning comfort. In warm weather conditions, auto stops may occur more frequently and the vehicle interior may be warmer as compared to the comfort air conditioning. This setting allows higher humidity inside the vehicle and window fogging before the engine restarts. @ (Recirculation): Press to turn on recirculation. An indicator light comes on. Air is recirculated to quickly cool the air inside the vehicle or prevent odors from entering. Press again to change to outside air and the indicator light turns off. Press AUTO to return to automatic operation and recirculation runs automatically as needed. The indicator light is off.