OnStar Overview
EmergencyHydraulic Clutch
For vehicles with a manual transmission, it is not necessary to regularly check
brake/clutch fluid unless there is a leak suspected.
Adding fluid will not correct a leak.
A fluid loss in this system could indicate a problem. Have the system inspected
and repaired.
When to Check and What to Us ...
Traction Control System (TCS)/StabiliTrak Light
The StabiliTrak or Traction Control
System (TCS) indicator/warning light comes on briefly when the engine is started.
If the light does not come on, have the vehicle serviced by your dealer.
If the system is working normally, the indicator light turns off.
If the light is on and not flashing, ...
Cooling System
The cooling system allows the engine to maintain the correct working temperature.
Engine Coolant Surge Tank and Pressure Cap
Engine Cooling Fan (Out of View)
Warning
An electric engine cooling fan under the hood can start up
even when the engine is not running and can cause injur ...