Engine Checks Before Operating - GMC C series 2002 Owner's Manual

Radiator Shutters -- Caterpillar
(If Equipped)
Radiator shutters aid engine warm
airflow through the radiator and charge air cooler to
conserve heat in cold conditions.
The radiator shutters on your vehicle (if equipped)
operate automatically. When the ignition switch is in
ON or START and the engine temperature is below
_ _
195 F (90 C), the shutters will close, blocking the flow
of air through the radiator and charge air cooler. When
the engine temperature reaches 195
shutters will open to the normal operating position.

Engine Checks Before Operating

When you've started your engine, let it run for 20 to
30 seconds before you put a load on the engine. But
don't leave the vehicle while the engine is running.
-
During this warm up period, check your warning lights
and gages:
D
If oil pressure doesn't begin to rise within
15 seconds of starting, stop the engine and
find the cause.
2-16
R
-
up by blocking the
_ _
F (90 C), the
D
If the engine coolant temperature gage needle goes
into the hot area on the gage, stop the engine and
find the cause of the overheating.
D
If you have air brakes, the dual
gage should read at least 105 psi (720 kPa) for both
service systems before you try to move the vehicle.
When air pressure is below 60 psi (420 kPa), the
LOW AIR light will come on and you will hear a
tone alarm. If the pressure doesn't build up or
-
drops during warm up, stop the engine and find
the cause before you try to move the vehicle.
Recommended air pressure before actually driving
away is 120 psi (830 kPa).
D
The charging system light should come on when
the ignition key is turned to ON or START and
should go out when the engine is running above idle.
If the light doesn't go out or comes back on during
normal engine operation, have the charging system
checked right away. (This light tells you if the
generator is not charging; it doesn't reflect the
condition of the battery.)
-
needle air pressure