Navistar WorkStar Series, Operator'S Manual

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Maintenance Instructions
CAUTION
If the coolant should get extremely low and
the engine very hot, let the engine cool for
approximately 15 minutes before adding coolant;
then, with the engine running, add coolant slowly.
Adding cold coolant to a hot engine may crack
the cylinder head or cylinder block. Never use
water alone.
NOTE: If excessive amounts of coolant must be added and
coolant system is equipped with bleeder valves, contact an
International® dealer for special instructions on filling the
coolant system.
For vehicles equipped with an opaque deaeration tank and two
sight glasses with engine COLD:
• Ensure coolant level fully covers lower sight glass, but
covers none or only part of upper sight glass.
• If coolant level fully covers upper sight glass, remove coolant
until top of coolant level can be seen in upper sight glass.
For vehicles equipped with an opaque deaeration tank and two
sight glasses with engine HOT:
• Assure coolant level fully covers lower sight glass.
• Coolant covers part or all of upper sight glass. Do not add
additional coolant if coolant is visible in upper sight glass.
For vehicles equipped with a translucent deaeration tank with
engine COLD:
• Assure coolant level is between ADD and MAX marks on
tank.
• If coolant level is above MAX mark, remove coolant until
coolant level is between ADD and MAX marks on tank.
For vehicles equipped with a translucent deaeration tank with
engine HOT:
• Assure coolant level is above the ADD mark on the tank. It
may exceed the MAX mark.
• Add a 50/50 coolant concentrate/water mixture if low. Hot
coolant needs room to expand. Do not overfill.
Filling Instructions
1. Coolant Make-up Tank
2. Coolant Deaeration Tank
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