Reactivation for Subsequent Owners
Push 
and follow the prompts to
speak to an Advisor as soon as
possible after acquiring the vehicle.
The Advisor will update vehicle records and will explain the OnStar service offers and options available.
See also:
What to Use
Use a mixture of one-half clean, drinkable water
and one-half DEX-COOL® coolant. If you use
this coolant mixture, you do not need to add
anything else.
CAUTION:
Adding only plain water to your ...
Engine Overheating
You will find a coolant temperature gage on your
vehicle’s instrument panel.
If your vehicle has a Driver Information Center
(DIC), the display will show an Engine Coolant
Hot/Engine Overheated ...
Reduced Engine Power Light
This light comes on
when a noticeable
reduction in the
vehicle’s performance
occurs.
The vehicle can be driven at a reduced speed
when the reduced engine power light is on,
but accelerati ...