GMC T-Series 1999 Owner's Manual page 97

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Intake Heater Indicator Light
(Diesel Engines)
Since the light is illuminated whenever the intake heater
is activated, it is normal for the light to cycle on and off
as the heater cycles during engine warm
"Engine Starting" in your Caterpillar
Maintenance Manual for more information.
This light on the instrument
panel will come on when
the intake heater is on and
the ignition switch is in ON.
-
up. See
R
Operation &
Diff Lock Indicator Light (If Equipped)
The light will come on momentarily during starting.
If the light fails to come on, have it repaired as soon as
possible so you will be aware when the lock system is
in use.
yellowblue
This light on the instrument
panel is on when the
-
inter
axle differential lock
system is in use.
2-61

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