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54
TM 9-2320-312-24-2
Systems Operation Section
The shunt line (4) extends from the top of the water
If the engine is equipped with an air compressor,
pump to an expansion tank. The shunt line must
coolant is supplied from the water temperature
be routed properly in order to avoid trapping any
regulator housing to air compressor (3) through
air. By providing a constant flow of coolant to the
coolant supply line (1). The coolant is circulated
water pump, the shunt line keeps the water pump
through the air compressor and the coolant is
returned to the cooling system through coolant
return line (2) into the cylinder head.
Note: Water temperature regulator (11) is an
important part of the cooling system. The water
Coolant Conditioner (If Equipped)
temperature regulator divides coolant flow between
the radiator and the bypass in order to maintain
Some conditions of operation can cause pitting.
the normal operating temperature. If the water
This pitting is caused by corrosion or by cavitation
temperature regulator is not installed in the system,
erosion. A corrosion inhibitor is a chemical that
there is no mechanical control, and most of the
provides a reduction in pitting. The addition of a
coolant will travel the path of least resistance
corrosion inhibitor can keep this type of damage
through the bypass. This will cause the engine to
to a minimum.
overheat in hot weather and the engine will not
reach normal operating temperature in cold weather.
The coolant conditioner element is a spin-on
element that is similar to the fuel filter and to the
Note: Air vent valve (12) will allow the air to escape
oil filter elements. The coolant conditioner element
past the water temperature regulator from the
attaches to the coolant conditioner base that is
cooling system while the radiator is being filled.
mounted on the front of the engine. Coolant flows
During normal operation, the air vent valve will be
from the water pump to the coolant conditioner base
closed in order to prevent coolant flow past the
and back to the cylinder block. Coolant constantly
water temperature regulator.
flows through the coolant conditioner element when
the valves are in the OPEN position.
Coolant For Air Compressor (If
The element has a specific amount of inhibitor
Equipped)
for acceptable cooling system protection. As the
coolant flows through the element, the corrosion
inhibitor goes into the solution. The corrosion
inhibitor is a dry solution, so the inhibitor dissolves.
The corrosion inhibitor then mixes to the correct
concentration. Two basic types of elements are
used for the cooling system. The two elements
are the precharge elements and the maintenance
elements. Each type of element has a specific
use. The elements must be used correctly in order
to get the necessary concentration for cooling
system protection. The elements also contain a
filter. The elements should remain in the system so
that coolant will flow through after the conditioner
material is dissolved.
The precharge element contains more than the
normal amount of inhibitor. The precharge element
is used when a system is first filled with new
coolant. This element must add enough inhibitor in
order to bring the complete cooling system up to
the correct concentration.
g00293082
Illustration 37
Coolant Lines For Air Compressor
(1) Coolant supply line. (2) Coolant return line. (3) Air compressor.

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