Cooling System Water (1-01)
Always use good quality soft water in the coolant mix-
ture. Water added to the cooling system must meet the
specifications given in the accompanying chart.
Antifreeze (1-02)
Low-silicate antifreeze must be mixed with quality water
at a 50/50 ratio (40 to 60% working range). A 50/50
mixture of antifreeze and water gives a -34°F freeze point
and a boiling point of 228°F, which is adequate for lo-
cations in North America. The actual lowest freeze point
of ethylene glycol antifreeze is at 68%. Using higher
concentrations of antifreeze will raise the freeze point of
the solution and increase the possibility of a silicate gel
problem.
A refractometer must be used to accurately measure the
freeze point of the coolant.
Using a floating ball hydrometers can give incorrect
readings.
Section 1 - Cooling System Cooling System Water (1-01)
N14 Page 1-13
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