2015 Buick Regal Owner Manual - Page 202

Driving and Operating See Dual Automatic Climate Control System on page 8-1. The warmer it is outside, the shorter the time before the engine is restarted to provide cabin cooling. To maximize fuel economy, use the eco air conditioning mode... 9-21 The shift lever is in P (Park), N (Neutral), R (Reverse), or M (Manual Mode). The high voltage battery pack charge is low. The hood is not fully closed. Brake pedal pressure is low. The malfunction indicator lamp (MIL) is on; this may prevent an auto stop. High humidity is detected. The air conditioning or defrost system need the compressor to maintain vehicle comfort. See Dual Automatic Climate Control System on page 8-1. The warmer it is outside, the shorter the time before the engine is restarted to provide cabin cooling. To maximize fuel economy, use the eco air conditioning mode. The climate control system is turned from off to normal air conditioning or defrost. See Dual Automatic Climate Control System on page 8-1. The engine is required to run for either heater or climate control performance. See Dual Automatic Climate Control System on page 8-1. 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). . . ... To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. . . The Engine Will Restart When: ... . The brake pedal is released. The accelerator pedal is applied. Shifting out of D (Drive) to any other gear. . .