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COOLING SYSTEM
Description. The cooling system consists of the radiator, fan,
water pump, thermostat, water passages in cylinder block and
cylinder head, and the necessary connections and
fittings.
The function of the cooling system is to keep the engine
at the most efficient operating temperature under all driving
conditions.
The thermostat, installed at the cylinder head outlet, restricts
the flow of coolant to the radiator until a predetermined tem-
perature is reached. During this restriction, a water by-pass
in the cylinder block permits pump circulation through the
engine. As the coolant warms up, the thermostat opens to
permit circulation through the
radiator.
Care. The cooling system must be kept in good condition if it
is to properly cool the engine under all operating conditions.
The radiator cap should be removed and the coolant level
checked frequently. If the coolant level is low, water or anti-
freeze should be added. All models are equipped with a pres-
sure type radiator cap.
NOTE: The volume of solution in a Chevrolet cooling system
expands about one quart
when its temperature is
changed from 32° to 160°;
therefore, the cooling system
should be left from one pint
to one quart low if filled cold,
especially when anti-freeze is
used, to prevent loss of solu-
tion
through
the
radiator
overflow pipe.
The fan belt tension
should be check-ed occasion-
Fig. 44-Fan Belt Adjustment
ally and, if necessary, adjusted to provide
%6"-%"
deflection.
The up or down movement from the normal position should
be measured at a point midway between fan and generator
pulleys
(fig.
44).
The system should be thoroughly checked for leaks. Tighten
screw type hose clamps
occasionally.
Twice
a.
year the radiator, cylinder block, and, where ap-
plicable, the automatic transmission oil cooler should be com-
pletely drained. Using a water hose the cooling system should
then be thoroughly flushed until the water runs
clear.
Then
• 36 •
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