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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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Table of Contents
Troubleshooting
