Cooling
System
DODGE
Turbo Diesel
Cooling
System
Malfunctions - Diagnosis
Page
7-5
Pressure
Caps
The
system is designed to use a pressure cap to prevent
boiling of the coolant.
An incorrect or malfunctioning cap can result in the
loss
of
coolant and the engine running hot.
The
cap
specified
for
this
system
is:
System
110°C [230°F]
Cap
103kPa[l5PSI]
Air
in the coolant can result In
loss
from
the overflow when the [^jS j
aerated coolant is hot. The heated air
expands,
increasing
the
pressure
in the
system
causing
the
cap
to open.
Similarly,
coolant can be
displaced
through the overflow if the
head
gasket
leaks
compression
gasses
to the coolant
system.
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1
a
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The
operating pressure of the coolant system and the
lubricating
system
can result in the mixing of the fluids if there
is
a ieak between the
systems:
head gasket, oil cooler, etc.
(refer to the Lubricating
System).
Note:
Transmission
oil can also leak
into
the coolant through a
faulty
transmission
oil cooler.
Water
(Coolant) Pump
The
water pump pulls coolant
from
the
bottom
of the radiator
and pumps it through the engine back to the top of the radiator
for
cooling.
Reduced
or
Interrupted
flow
will
result in the engine
running hot.
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