TM 9-2320-363-20-1
The engine coolant is drawn from the lower portion of the radiator by the water pump and is
forced through the oil cooler and into the cylinder block.
From the cylinder block, the coolant passes up through the cylinder head and, when the
engine is at normal operating temperature, through the thermostat housing and into the upper
portion of the radiator. Then the coolant passes down a series of tubes where the coolant
temperature is lowered by the air stream created by
vehicle.
Upon starting a cold engine or when the coolant
is restricted at the thermostat housing and a bypass
water pump housing provides water circulation within
the revolving fan and the motion of the
is below operating temperature, the coolant
pipe from the thermostat housing to the
the engine during the warmup period.
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