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:
Storing Memory Positions
To save into memory:
1. Adjust the driver seat, including the seatback recliner and lumbar, both outside
mirrors, power steering column, and the throttle and brake pedals.
See Power Mirrors ...
Removal and Installation of the Sealant Canister
To remove the sealant canister:
1. Unlock the air only hose (F) from the tire sealant canister (B) by pulling
up on the lever.
2. Pull the air only hose (F) from the tire sealant canister (B).
...
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. ...