Engine Coolant 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).

See also:

Anti-theft Alarm System Messages
THEFT ATTEMPTED This message displays if the vehicle detects a tamper condition. ...

Universal Remote System Operation
Press and hold the appropriate button for at least half of a second. The indicator light will come on while the signal is being transmitted. ...

What Makes a Denali
The changes from a regular Acadia to a Denali are obvious from the outside, and they make the Acadia Denali look more put together, as if it were sculpted from one piece of metal rather than glued ...