See also:

How OnStar Service Works
Automatic Crash Response, Emergency Services, Crisis Assist, Stolen Vehicle Assistance, Vehicle Diagnostics, Remote Door Unlock, Roadside Assistance, Turn-by-Turn Navigation, and Hands-Free ...

Engine Coolant Temperature Gauge
Metric English This gauge measures the temperature of the vehicle's engine. If the indicator needle moves into the shaded area, the engine is too hot. While driving under normal op ...

What to Use
To determine what kind of fluid to use, see Recommended Fluids and Lubricants  . Always use the proper fluid. Notice: Use of the incorrect fluid may damage the vehicle and the damages may not ...