GMC 1994 Yukon Owner's Manual page 126

Low Coolant Warning Light
m
The orange Low
Coolant Warning
light, if you have one,
is located in the upper
left corner of the
instrument cluster.
If you have a diesel engine, you have a low coolant light. If this light comes
on anytime the engine is running, your system is low on coolant and the
engine may overheat. See "Engine Coolant" in the Index and have your
vehicle serviced as soon as you can.
Charging System Warning Light
1 - 1
The red Charging
System Warning light
is located at the upper
right corner of the
instrument cluster.
I
The Charging System Warning light should come on briefly when you turn
on the ignition, before starting the engine, as a check to show you it is
working. After the engine starts, the light should go out. If it stays on or
comes on while you are driving, you may have a problem with your
charging system. It could indicate a problem with the alternator drive belt,
or some other charging system problem. Have it checked right away.
Driving while this light is on could drain your battery.
If you must drive a short distance with this light on, it helps to turn off all
your accessories, such as the radio and air conditioner.
2-70