Engine Coolant Heater
The engine heater can provide easier starting and better fuel economy during engine warm-up in cold weather conditions at or below −18°C (0°F). Vehicles with an engine heater should be plugged in at least four hours before starting.
An internal thermostat in the plug-end of the cord may exist which will prevent engine coolant heater operation at temperatures above −18°C (0°F).
If the vehicle has a diesel engine, see the Duramax Diesel supplement for more information.
See also:
Fuel E85 (85% Ethanol)
Vehicles that have a FlexFuel badge and a yellow fuel cap can use either unleaded
gasoline or ethanol fuel containing up to 85% ethanol (E85). See Fuel E85 (85% Ethanol)
on page 9‑53. For al ...
Exterior Lighting
The exterior lamps control is located on the instrument panel to the left of the steering wheel.
: Turns off the automatic headlamps and Daytime Running Lamps (DRL). Turn the headlamp control ...
Onstar.com
The website provides access to account information, manages the OnStar subscription, and allows viewing of videos of each service.
Get subscription plan pricing and sign up for OnStar Vehicle Diagnos ...