TM10-3950-672-24-2
The coolant flow can also be reduced if the inlet hose to
the water pump collapses. A hose will usually not
collapse while the engine is running at low speed.
Check the hose while the engine is running at rated
speed.
Note: Be sure the engine is warm, a
minimum of 95 [203 F], so the
C
thermostat is open.
A worn or malfunctioning water pump will not produce
the flow required to prevent the engine from running hot.
However, be sure to check the other possibilities
indicated in the Troubleshooting Logic before checking
the flow or replacing the pump.
As stated in the coolant discussion, an obstruction in the
passages can interrupt flow.
Radiator, Fans and Shutters
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.
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