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Use a fine grade of steel wool for severe
cases.
Do not use gasoline,
kerosene, or any oil product that will discolor the sidewalls or rot the
rubber.
COOLING SYSTEM
COOLING SYSTEM CAPACITIES
6 cylinder engine
18~
qts.-with underseat heater, 20 qts.
8 cylinder engine 18%, qts.-with underseat heater, 20Y2 qts.
THERMOSTAT AND SEALED COOLING RADIATOR CAP-
Water temperature is controlled by a thermostat in the water outlet
elbow on the cylinder head. When the engine
is cold (below operating.
temperature) the thermostat is closed a large part of the time; pre-
venting the water from circulating through the radiator core thus
shortening the warm-up period. This also shortens the length of time
required to get heat to your hot water
heater.
When the engine
reaches operating temperature the thermostat opens and allows the
water to pass through the radiator as usual.
A 7
lb.
per sq.
in.
radiator pressure cap is used to provide better cooling.
On initial warm up of the engine from a cold start the radiator pressure
cap will cause the engine temperature to rise to about 180
0
with the
standard 1510 thermostat. The temperature will drop as the car con-
tinues in operation after the thermostat has once opened completely.
Due to this characteristic of the higher pressure system, the use of a
160
0
or 170
0
thermostat with alcohol or methanol base anti-freeze
solution may cause the coolant to boil under certain
conditions.
There-
fore, only the 1510 thermostat should be used with these types of anti-
freeze.
Anoticeable hissing or singing noise resulting from the valve in the
sealed cooling cap opening and closing may be from engine overheating.
BLOWING INSECTS FROM RADIATOR
CORE-Excessive
accumulation of insects may block the air passages of the radiator
core and cause overheating of the cooling system. This condition can
be easily corrected by having the radiator air passages blown out with
compressed air at your Pontiac
dealer.
Or if you prefer, you can do it
yourself by using the garden hose to force water through the radiator
(from the engine side to the grille) thereby removing the insects from
the front of the
core.
CHECKING COOLANT LEVEL-It
should not be necessary to
check coolant level unless temperature gauge shows overheating, and
then
n~t
until engine is stopped and allowed to cool to normal. The
coolant level should be kept at approximately three inches below the
top of the filler neck.
[ 241
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