See also:

Consistency of Readings
Always check the fluid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If inconsistent readings per ...

Engine Coolant Temperature Gauge
Metric English This gauge shows the engine coolant temperature. If the gauge pointer moves toward the shaded area, the engine is too hot. In eAssist vehicles, the engine coolant warnin ...

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 ...