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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
COOLING SYSTEM
Freezing Point C (F)
Percentage Anti-Freeze Concentration
by Volume
Specific Gravity @ 16
deg. C (60 deg. F)
0 deg. (+32)
0
1.000
-7 deg. (+20)
15
1.025
-12 deg. (+10)
25
1.040
-18 deg. (0)
33
1.053
-23 deg. (-10)
40
1.062
-29 deg. (-20)
45
1.07n
-34 deg. (-30)
48
1.074
-40 deg. (-40)
53
1.080
-46 deg. (-50)
56
1.088
-51 deg. (-60)
59
1.092
-57 deg. (-70)
62
1.095
-63 deg. (-80)
65
1.097
-68 deg. (-90)
67
1.098
-69 deg. (-92)
68
NOTE: As shown below, a further increase in anti-freeze volume increases the freezing
point.
-63 deg. (-80)
71
1.100
-57 deg. (-70)
75
1.106
-51 deg. (-60)
79
1.110
-46 deg. (-50)
83
1.113
-40 deg. (-40)
87
1.117
-34 deg. (-30)
91
1.119
-34 deg. (-30)
95
1.123
-22 deg. (- 8)
100
1.127
of concentration.
c.
Anti-freeze
containing
sealer
or
antileak
additives should not be used in IH engines.
These additives may cause plugging problems
in the cooling system and restrict coolant flow.
d.
Anti-freeze formulated with methoxy propanol or
propolene glycol is not recommended for use in
IH engines due to a reaction with engine internal
seals, coolant hoses and potential fire hazard
due to lower flash points than ethylene glycol
type anti-freeze.
3.
Coolant Conditioners
All cooling system inhibitors, including those in anti-
freeze solutions, become depleted through normal operation. If
the inhibitors in antifreeze are allowed to become depleted, the
antifreeze becomes corrosive and attacks and coats the metallic
surfaces of the cooling system. This coating reduces the heat
transfer. Cooling system conditioners which contain these
inhibitors must be added to maintain corrosion protection.
These conditioners are available as a liquid or in a coolant filter.
The two types of recommended conditioners are as
follows:
a.
IH coolant conditioner is a complete inhibitor
system, of a non-chromate type, which provides
corrosion protection, pH control for maintaining
an acid-free coolant and water softening to
prevent the formation of mineral deposits. It is
compatible with both water and IH anti-freeze
and coolant.
b.
Coolant filters which are coolant conditioners of
the universal borate type are approved for use
on IH truck engines. These borate type spin-on
filters are compatible with IH anti-freeze and
coolant and with IH cooling conditioner water
solutions.
Soluble oil is not recommended for use on IH truck
engines as its use will reduce heat transfer. There are no
miracle additives that will increase heat transfer or prevent
overheating. Conditioned water is still the best coolant.
COOLANT SYSTEM COMPONENTS
The following is a list of the major components making
up the cooling system. Points of inspection of each component
are covered in
CTS-2019P Page 4
PRINTED IN UNITED STATES OF AMERICA
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