Evening star., 1923-11-11
Ouerl,eating, Not Pressing, Foe
To Auto During Cold Months
Fine Points of Motor Cooling to Auoid
Numerous Troubles Outlined
by|Expert.

opens the cover half way that will suf-
fee to keep the engine from overheat-
ing. and that would undoubtedly be the
case were it not for the amount OF
water he has lost through few Of
these processes of forgetting to open
the covering device in time.
The next point TO consider is the
cooling medium" the water.
/ One might lay down a set Of rules for
the proper amount of air to admit
through the radiator for certain
weather conditions, and they would re-
temperatures: but when a 25 per cent
addition Of alcohol is made to keep the
radiator and system immune from
freezing down to a temperature Of two
degrees, above zero the situation is
changed.
Just as the addition of alcohol lowers
the freezing point so does it lower the
boiling point, fact which means that
while many car owners are saving their
radiators they're running their motors.
They will frequently drive along with
the motometer registering close to the
danger point, content in the belief that
the instrument should register more
due to the confinement of the radiator,
whereas the motometer should regis
| ter less than the actual temperature of
the system due to its exposure to the
freezing draft Of air.
! AS a f1fty-fifty solution boils at
from LOO u If0 degrees fanTennelI, [,
the necessity of balancing the flow
of air through the radiator is evident,
yet that Is exactly what most motor
| lists overlook and why so many en-
gines are damaged through overheating
in winter time.
The matter of correct engine tenn
! perature is as delicate as the adjust
| ment of a carburetor. In the latter
| it's matter of balance between air
and fuel, in the former between water
| Cor the cooling anti-freeZe solution)
| and air. Obviously the water itself
| before mixture with alcohol must be
clean, otherwise the boiling point will
be lower than ever.
Rust flinders Cooling.
Rust in the water retains heat too
long and also hinders the free cir
| culation of the water The whole
system should be drained out be-
fore alcohol is added. 1t should then
be washed with water in which soda
has been dissolved. This done. a
thorough rinsing should follow and
| then another washing out with a
20 per cent solution of hydrochloric
acid to neutralize the effect of the
alkali washing soda.
When the system is again thor
oughly rinsed out it is ready for n
15 per cent solution of alcohol in
water. IhlS Will keep the engine
safe from Jack Frost down to eleven
degrees above and will not lower the
boiling point enough to cause trouble
ii the radiator front is kept open on
milder days and the engine is not
allowed to idle.
As the alcohol evaporates readily
1t is advisable, If the weather con-
tinues freezing, to add alcohol in
stead Of water for the normal addi-
tions. using water, however,. If the
system seems to require more than
just a little. Alcohol, furthermore.
, will leak past places which water
would not touch. a fact which should
encourage the owner to have any leak
Immediately stopped.
If the motorist cares to go to the
expense the addition of glyeerine to
alcohol in equal parts Will raise the
boiling point, thus making it less
necessary to watch the temperature
so carefully.
The load to be pulled by the engine.
together with the bad traction and
| rough going in winter, makes it nee
essary to balance the engine temper
ature carefully. When snow is on
the ground the engine is constantly