Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
See also:
Cooling System
When it is safe to lift the hood:
A. Engine Cooling Fan (Out of View)
B. Engine Coolant Surge Tank and Pressure Cap
WARNING
An electric engine cooling fan under the hood can start up even ...
Recreational Vehicle Towing
If the vehicle is a hybrid, see the hybrid supplement for more information.
Recreational vehicle towing means towing the vehicle behind another vehicle –
such as behind a motorhome. The two most co ...
Rear Safety Belt Comfort Guides
This vehicle may have rear shoulder
belt comfort guides. If not, they are
available through your dealer.
The guides may provide added
safety belt comfort for older children
who have outgrown ...