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GENERAL
12
Antifreeze may retain its freeze protection for more than one season but coolant conditioners must be added to maintain corro-
sion protection.
Antifreeze formulated with methoxy propanol or propylene glycol is not recommended for this system.
Do not mix types of antifreeze solutions. Mixed solutions make it impossible to determine the protection against freez-
ing. Antifreeze containing sealer or antileak additives should NOT be used in this system. Sealer or antileak additives
will cause plugging problems in the cooling system.
WARNING! Use extreme caution when adding coolant to a hot radiator. Wear gloves and goggles
Check the solution periodically and at normal operating temperature to be sure the cooling system has sufficient protection
against freezing.
An antifreeze concentration greater than 68 percent will adversely affect antifreeze protection and heat transfer rates. Although
an antifreeze concentration from 69 percent to 100 percent has a higher freezing point than one of 68 percent, the rate of heat
transfer is reduced. Thus, do not use a concentration greater than 68 percent. Also, never use a 100 percent concentration of
antifreeze because it will corrode and damage the cooling system.
The following table shows the approximate percentage of antifreeze solution required for various temperatures.
Approximate Freezing Point
0° C (+32° F)
-7° C (+20° F)
-12° C (+10° F)
-18° C (0° F)
-23° C (-10° F)
-29° C (-20° F)
-34° C (-30° F)
-40° C (-40° F)
-46° C (-50° F)
-51° C (-60° F)
-57° C (-70° F)
-62° C (-80° F)
-68° C (-90° F)
-69° C (-92° F)
In tropical climates where antifreeze availability may be limited, use a corrosion inhibitor DCA4, to protect the engine cooling
system.
01-8
and keep your face away from the radiator filler neck to avoid being burned.
Percentage of Antifreeze
Concentration by Volume
FUEL, COOLANT, AND LUBRICANTS
Specific Gravity at 16° C (60° F)
0
15
25
33
40
45
48
53
56
59
62
65
67
68
1.000
1.025
1.040
1.053
1.062
1.070
1.074
1.080
1.083
1.088
1.092
1.095
1.097
1.098
GD530/650/670
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