IMPORTANT: The surge tank must be cool to
check the coolant level.
3.
Check the engine coolant level in the radiator
surge tank. See
Fig. 23.6.
NOTICE
Coolant must be filled to the full line of the surge
tank. Low coolant could result in engine over-
heating, which could cause engine damage.
3.1
If the coolant is low, fill the surge tank to
the full line with a 50/50 mixture of water
and the type of antifreeze currently in-
stalled in your vehicle.
3.2
If the surge tank was empty, start the en-
gine after refilling and check the level
again when the engine is at operating
temperature.
WARNING
Washer fluids may be flammable and poisonous.
Do not expose washer fluid to an open flame or
any burning material, such as a cigarette. Always
comply with the washer fluid manufacturer’s rec-
ommended safety precautions.
4.
Check the windshield washer reservoir fluid level.
See
Fig. 23.7.
Cab Inspection
1.
Push the reset button on the dash-mounted air
intake restriction indicator, if equipped.
2.
With the ignition switch in the OFF position,
check the air-pressure warning system.
2.1
If not previously drained, drain the air res-
ervoirs using moderate brake applications
until pressure in both reservoirs is less
than 70 psi (483 kPa).
2.2
Turn the ignition to the ON position. The
ICU will complete a full gauge sweep and
bulb check, and an audible warning will
sound. Ensure the low air pressure lamp
remains illuminated and an audible warn-
ing continues to sound after the gauge
sweep is complete.
3.
Check air governor cut-in and cut-out pressures.
3.1
Start the engine and ensure the low air
pressure lamp goes out and the buzzer
silences when pressure reaches approxi-
mately 70 psi (483 kPa) in both air reser-
voirs.
The air governor should cut out at ap-
proximately 120 psi (827 kPa). For ve-
hicles with an optional dryer reservoir
module (DRM), the cut-out pressure is
approximately 130 psi (896 kPa).
3.2
With the engine idling, apply the brake
pedal several times. The air governor
should cut in when pressure in the primary
air reservoir (top air gauge) reaches ap-
proximately 100 psi (690 kPa).
4.
Check air pressure build-up time.
4.1
With the air system fully charged, make
one full brake application and note the air
pressure reading on the primary air
gauge.
05/24/2011 f602459
1
1. Washer Reservoir Fill Tube
Fig. 23.7, Windshield Washer Reservoir Location (right-
hand side location shown)
Pre- and Post-Trip Inspections and Maintenance
23.5
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