OnStar®
OnStar OverviewChecking Coolant
The vehicle must be on a level surface when checking the coolant level.
It is normal to see coolant moving in the upper coolant hose return line when
the engine is running.
Check to see if coolant is visible in the coolant surge tank. If the coolant
inside the coolant surge tank is boiling, do ...
Uniform Tire Quality Grading
The following information relates to the system developed by the United States
National Highway Traffic Safety Administration (NHTSA), which grades tires by treadwear,
traction, and temperature performance. This applies only to vehicles sold in the
United States. The grades are molded on the s ...
Roof Rack System
Warning
If something is carried on top of the vehicle that is longer or
wider than the roof rack-like paneling, plywood, or a mattress-the wind can catch
it while the vehicle is being driven. The item being carried could be violently
torn off, and this could cause a collision and damage the v ...