TM10-3950-672-24-2
Air in the coolant can result in loss from the overflow
when the aerated coolant is hot. The heated air
expands, increasing the pressure in the system causing
the cap to open.
Similarly, coolant can be displaced through the overflow
if the head gasket leaks compression gasses to the
coolant system.
The operating pressure of the coolant system and the
lubricating system can result in the mixing of the fluids if
there is a leak between the systems: head gasket, oil
cooler, etc. (refer to the Lubricating System).
Note: Transmission fluid can also
leak into the coolant through bottom
tank oil coolers.
Water (Coolant) Pump
The water pump pulls coolant from the bottom of the
radiator and pumps it through the engine back to the top
of the radiator for cooling. Reduced or interrupted flow
will result In the engine. running hot.
The pump is belt driven from the crankshaft pulley. An
automatic belt tensioner is used to prevent the belt from
slipping on the pump pulley. A malfunction of the
tensioner will cause the water pump impeller to rotate at
a slower speed reducing the amount of coolant flow.
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