Cooling System
DODGE
Turbo Diesel
Cooling System Malfunctions
-
Diagnosis
Page
7-7
Radiator
Air
Flow
Air forced through the fins of the radiator by
a
fan cools the
coolant pumped through the radiator. Environmental debris
(paper, straw, lint, dust, etc.) can obstruct the fins and stop the
flow of air
which
will reduce the cooling effect of the radiator.
A
slipping belt will result in
a
slower fan speed and reduced
cooling.
A
malfunctioning automatic belt tensioner can be the
problem.
Note:
Check the bearings in the fan hub and other pulleys
to
make sure they are
not
causing
excessive
belt slippage and
vibration.
Thermatic fans operate only as needed
to
keep the coolant
at
the correct temperature.
If
the fan does not operate when the
coolant temperature
Increases,
the
engine will run hot.
If
the
fan does not shut off when coolant temperature
decreases,
the
engine will run cold.
Note:
Make
sure
that
the
coolant temperature
sensor
is
functioning correctly.
An incorrect fan shroud or obstructions can reduce air
flow
and
cause
the engine to run hot.
Note:
Check
to be
sure
air
is
not
re-circulating. Check
for
missing
baffles.
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