Chevrolet Light Operator's Manual page 39

The availablc __ commercial materials which may be used for
preparing anti-freezing solutions are denatured alcohol, meth-
anol, propanol, ethylene glycol, and distilled glycerine.
Kerosene or other oils, or solutions containing calcium chio-
ride, magnesium chloride, sodium silicate or other inorganic
salts, honey, glucose or sugar are not satisfactory for use in
the cooling system.
Alcohol. Denatured alcohol and methanol are used extensively
for anti-freezing solutions. The various types of alcohol anti-
freeze afford protection against freezing and have the advan-
tage of wide distribution and low first cost.
There are, however, two important disadvantages. Alcohol
is lost, especially on warm days and on hard driving, and,
unless the solution in the radiator is tested periodically and
sufficient alcohol added to replace the loss, the engine or radi-
ator, or both, are likely to be damaged by subsequent freezing.
The vehicle finish is softened and damaged by contact with
alcohol solutions or vapors. Alcohol accidentally spilled on
the finish should be flushed off immediately with a large
quantity of cold water without wiping or rubbing.
The use of an overflow tank, connected to the overflow pipe
of the radiator, serves to condense and trap vapor or liquid
that would otherwise be lost. On cooling, the condensate or
liquid is returned to the radiator. The surge or overflow tank
is particularly useful when alcohol anti-freeze is used, and
especially in territories where the atmospheric temperature
fluctuates over a wide range during the winter months.
GM METHANOL PROTECTION TABLE
QuartsGfGMM . thlnotRequirMfo, Anli.f,eel e
P'oteclion . t Temperltu,es shown below
2 3 4 5 6 7 8 9 10
15~
130
50 -=S:--=ir
_30° _45° - - - -
'16 2JO 15° 7° _2° _12° _24 ° _38° _52°
17.5 23° 17° 10° 2° _7° _17° _28° _41° _52°
'18.5 23° 18° 12° 5° _3° _13° _23° _35° _46°·
See Page 98 for cooling system capacity.
*A Hot Water Heater adds about one quart to Standard
System Capacity.
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