OnStar

See also:

Underbody Maintenance
Use plain water to flush dirt and debris from the vehicle's underbody. Your dealer or an underbody car washing system can do this. If not removed, rust and corrosion can develop. ...

Checking Coolant
The vehicle must be on a level surface when checking the coolant level. The coolant level should be at or above the FULL COLD mark when the engine is cold. The coolant level should be above the ...

Erasing Speed Memory
When you turn off the cruise control or the ignition, the cruise control set speed memory is erased. ...