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Anti-Freezing Solutions
In selecting an anti-freezing solution for winter operation
the local conditions and the type of service should be consid-
ered. The following information is given to assist the truck
owner in selecting the anti-freezing solution best suited to
meet his own individual driving
conditions.
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 may be 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.
GM METHANOL PROTECTION TABLE
Cooling
Quarts of GM Methanol Required for Anti
·
freeze
System
Ca&acity
Protection at Temperatures shown below
in uarts
3
4
5
6
7
8
9
10
--
~
--
-
16
3°
_8°
_21°
_36°
_52°
17
14°
6°
_4°
_16°
_29°
_45°
18
16°
8°
_1°
_12°
_25°
_38°
_52°
19
16°
9°
1°
-
8°
_20°
_32°
_45°
20
17°
11°
3°
-
5°
_16°
_27°
_39°
_52°
21
18°
12°
5°
- 3°
_12°
_22°
_34°
_46°
22
19°
13°
7°
0°
- 9°
-18°
_29°
_40°
23
20°
14° .
8°
1°
-
r
_15 0
_25°
_36 0
24
20 0
15 0
10 0
3 0
-
4 0
_
120
_210
_310
See Page 96 for cooling system capacity.
A hot water heater adds about one quart to standard system
capacity.
Other alcohol and methanol anti-freeze should be used in
accordance with instructions issued by the anti-freeze manu-
facturer.
Ethylene Glycol. Ethylene glycol is, in first cost, moreexpen-
sive than alcohol. Ethylene glycol anti-freezing solutions have
the distinct advantage of possessing a somewhat higher boiling
• 38 •
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