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 
, and
an Advisor can run a check.
See also:
Rainsense™
For vehicles with Rainsense, a
sensor located near the top center
of the windshield detects the
amount of water on the windshield
and automatically controls the
frequency of the windshield w ...
Tachometer
The tachometer displays the engine speed in revolutions per minute (rpm). ...
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 ...