Navistar WorkStar Series, Operator'S Manual

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Maintenance Instructions
1. Coolant System Vent Valve
2. Vented Fill Cap
3. Deaeration Tank
4. COLD MIN and COLD MAX Lines
To function properly, the coolant system must be completely filled
with coolant and all air must be expelled. To accomplish this, the
following procedures should be carefully completed:
1. Turn on ignition without starting the vehicle. This opens the
electrically actuated LTR coolant flow valve.
2. Fully open cab heater coolant shut-off valves and coolant
system vent valve.
3. Remove fill cap and pour a 50/50 mixture (75/25 if it has
been flushed with water) of the proper (Nitrite-Free Shell®
Ultra Extended Life Coolant) coolant concentrate and
demineralized or distilled water into the de-aeration tank. A
50/50 coolant mixture will achieve a -34° F (-37° C) freeze
point. A 53/47 coolant mixture will achieve a -40° F (-40° C)
freeze point. The first pour should reach to the top of the
reservoir fill neck.
4. Because the radiator fills slowly, it is important to continue to
top off the system for two minutes following the initial fill.
5. Close coolant system vent valve, start the engine, and
continue to add enough coolant to keep the coolant level
between the COLD MIN and COLD MAX levels marked on
the deaeration tank. Replace the deaeration tank cap tightly
after adding make-up coolant for two minutes.
6. Run engine at governed speed until engine fan has fully
engaged for 5 minutes. Do not exceed 220° F (104° C).
7. Let engine completely cool. Re-check coolant level and
concentration/freeze point with a refractometer and top off
as needed to achieve a coolant level at the COLD MAX line
when cold.
Coolant and Optional Coolant Filter
The cooling system in vehicles with MaxxForce® 11 and 13
engines, is filled at the factory with Nitrite-free Shell Rotella®
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