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point than alcohol anti-freezing solutions and, consequently,
may be operated at a higher temperature, resulting in a more
effective performance of the heater.
"GM Ethylene Glycol" is especially treated and compounded
for use in the cooling system. Other ethylene glycol prepara-
tions are available, but only those containing suitable corrosion
inhibitors and compounded for use in automotive cooling sys-
tems should be used.
GM ETHYLENE GLYCOL PROTECTION TABLE
Cooling
System
Quarts of GM Ethylene Glycol Required for Anti-Freeze
Capacity
Protection at Temperatures shown below
in
Quarts
3
4
5
6
7
8
9
10
11
--
--
- - - -
- -
---
---
16
17°
10°
2°
_8°
_19°
_34°
_52°
17
18°
12°
5°
_4°
_14°
_27°
_42°
18
19°
14°
7°
0°
_10°
_21°
_34°
_50°
19
20°
15°
9°
2°
-JO
_16°
_28°
_42°
20
16°
10°
4°
-
3°
_12°
_22°
_34°
_48°
21
17°
12°
6°
0°
-
9°
-lJO
_28°
_41°
22
18°
13°
8°
2°
-
6°
_14°
_23°
_34°
23
19°
14°
9°
4°
-
3°
_10°
_19°
_29°
24
19°
15°
10°
5°
0°
_ 8°
_15°
_24
0
See Page 96 for cooling system capacity.
A hot water heater adds about one quart to standard system
capacity.
Other ethylene glycol anti-freezes should be diluted in
accordance with the instructions issued by the anti-freeze manu-
facturer.
Glycerine. Radiator glycerine, which is chemically treated to
avoid corrosion in accordance with the formula approved by
the Glycerine Producers' Association, is satisfactory for use in
the cooling system.
Servicing the Cooling System. Before installing anti-freezing
solution, the cooling system should be inspected and serviced
for winter
operation.
The system should be thoroughly cleaned
and all loose scale and iron rust removed.
Cylinder head bolts should be tightened to avoid the pos-
sibility of anti-freezing solutions leaking into the engine or
exhaust gas blowing into the cooling system. Anti-freeze or
water mixed with engine oil may form sludge, which will
interfere with lubrication and, in some cases, may form var-
nish-like deposits which will cause gumming and sticking of
the moving parts.
• 39 •
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