OnStar Services

See also:

Checking Coolant
The vehicle must be on a level surface when checking the coolant level. Check to see if coolant is visible in the coolant recovery tank. If the coolant inside the coolant recovery tank is boili ...

Auto Defog
This will allow you to turn the auto defog on or off. Only vehicles with the dual zone climate control will have this option. Press SELECT when Auto Defog is highlighted to open the menu. Tur ...

Towing a Trailer
CAUTION: If you do not use the correct equipment and drive properly, you can lose control when you pull a trailer. For example, if the trailer is too heavy, the brakes may not work well — or ...