TM10-3950-672-24-2
If the fan is belt driven, a slipping belt will result in a
slower fan speed and reduced cooling.
A
malfunctioning automatic belt tensioner can be the
problem.
they are not causing excessive belt
vibration and slippage.
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
recirculating.
Check for missing
baffles.
Thermostat
The thermostat controls the coolant temperature. When
the coolant temperature is below the operating range,
coolant is bypassed back to the inlet of the water pump.
When the coolant temperature reaches the operating
range, the thermostat opens, sealing off the bypass,
forcing coolant to flow to the radiator.
Caution: Never operate the engine
without a thermostat.
Without a
thermostat the path of least
the bypass to the pump inlet. This
will cause the engine to overheat.
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