Chevrolet 1994 Astro Passenger Owner's Manual page 124

HOT COOLANT CAN BURN YOU BADLY!
In "Problems on the Road," this manual shows what to do. See "Engine
Overheating" in the Index.
Voltmeter
Standard Cluster Digital Cluster
When your engine is not running, but the ignition is on (in the
RUN
position), the gage shows your battery's state of charge in DC volts. When
the ignition is running, the gage shows the condition of the charging system.
Readings between the low and high warning zones indicate the normal
operating range.
Readings in either warning zone indicate a possible problem in the electrical
system.
On the digital cluster, a box around the voltmeter symbol will begin the
flash when the charging system needs service.
You can only drive for a short time with the readings in either warning zone.
If you must drive, turn off all unnecessary accessories.
2-64