Operating Instructions
– 23 –
Y53-1030A 12/09
PACCAR
WARNING! Removing the radiator fill cap while
the engine is hot can be dangerous. Never
remove the caps of the expansion tank while the
engine is still hot; you could be badly burned.
• Scalding steam and fluid under pressure may
escape and cause serious personal injuries.
• Wait until the coolant temperature is below
122°F (50°C).
• Protect your face, hands, and arms by covering
the cap with a large, thick rag to protect
against escaping fluid and steam.
• Carefully and slowly turn cap one turn to allow
excess pressure to escape, then push down
and turn for final removal. See the Truck Oper-
ator’s Manual for instructions on checking and
filling the coolant expansion tank.
Take the time to learn what normal operating conditions are
for your engine so that when an abnormal condition arises,
you will be able to recognize it as such and take the
appropriate action.
Most failures give an early warning. Look and listen for
changes in performance, sound, or engine appearance that
can indicate service or engine repair is needed. Some
changes to look for are:
• Engine misfires.
• Vibration.
• Unusual engine noises.
• Sudden changes in engine operating temperatures or
pressures.
• Excessive smoke.
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