OnStar Vehicle Diagnostics can perform a vehicle check every month. It will check
the engine, transmission, antilock brakes, and other major vehicle systems. It also
checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring
System. If an On-Demand Diagnostics check is needed, press
, and an Advisor can run a check.
Connections
OnStar Additional InformationCooling 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 ...
Buying New Tires
GM has developed and matched specific tires for the vehicle. The original equipment
tires installed were designed to meet General Motors Tire Performance Criteria Specification
(TPC Spec) system rating. When replacement tires are needed, GM strongly recommends
buying tires with the same TPC Sp ...
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 ...