See also:

Engine Heater
The engine coolant 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 ...

Engine Coolant Temperature Gauge
Metric English This gauge shows the engine coolant temperature. If the engine coolant overheats, the engine coolant temperature warning light comes on. See Engine Coolant Temperature W ...

Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the v ...