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:
Consistency of Readings
Always check the fluid level at least twice using the procedures described. Consistency
(repeatable readings) is important to maintaining proper fluid level. If fluid is
added, it may take 15 minu ...
Turn-by-Turn Navigation
1. Push to connect to a live
Advisor.
2. Request directions.
3. Directions are downloaded to
the vehicle.
4. Follow the voice-guided
commands. ...
Engine Air Cleaner/Filter
The engine air cleaner/filter is in the
engine compartment on the driver
side of the vehicle, near the front.
See Engine Compartment Overview for more information
on location. ...