A Series Diesel Engine Coolant System 59
If the fan is belt driven, a slipping belt will result in a
slower fan speed and reduced cooling. A
malfunctioning 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 blet vibration and slippage.
Interruption of the circuit to an electrically driven fan
can result in insufficient airflow and cause the engine
to run hot.
Note : Make sure that the temperature sensor is
functioning correctly.
Shutters are designed to control air flow across the
radiator. If the shutters fail to open when needed, the
engine can run hot. Failure of the shutters to close
can result in too much air flow and the engine
running cold.
Note : Make sure that the air temperature sensor is
functioning correctly. Check the air operated
shutter controls. Check for air leaks.
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