2012 Buick Regal Owner Manual - Page 245

Driving and Operating The Engine Will Restart When: ... 9-23 The brake pedal is released. The accelerator pedal is applied. Shifting out of D (Drive) to any other gear. If eco air conditioning is selected, the duration of the auto stop will depend on the outside temperature. This economy mode improves fuel economy by limiting the effects of the air conditioning. The warmer it is outside, the shorter the time before the engine is restarted to provide cabin cooling. . The climate control system is turned from off to normal air conditioning or defrost. See Dual Automatic Climate Control System on page 8￿3 for more information. The engine is required to run for either heater or climate control performance. See Dual Automatic Climate Control System on page 8￿3 for more information. The high voltage battery pack charge is low and requires recharging. Auto stop time is greater than two minutes. The hood is opened. Engine Heater The engine coolant heater, if available, can help in cold weather conditions at or below −18°C (0°F) for easier starting and better fuel economy during engine warm-up. Plug in the coolant heater at least four hours before starting the vehicle. An internal thermostat in the plug-end of the cord will prevent engine coolant heater operation at temperatures above −18°C (0°F). . . . .