11-33
If the coolant becomes very dirty, replace it immedi-
ately regardless of the specified replacement inter-
vals.
1 Recommended coolant
Use a coolant containing fully-formulated antifreeze
and soft water in the correct mixing ratio.
This solution provides corrosion inhibitors to protect
the cooling system.
Replace the coolant, and top it off when necessary,
only with water containing fully-formulated anti-
freeze with corrosion inhibitors.
2 Water used with coolant
Use soft water with the properties shown in the fol-
lowing table. Do not use hard water from wells and
rivers as it is liable to form scale and cause corro-
sion.
3 Using coolant additive
To prevent the cooling system from freezing and to
minimize corrosion, use a fully-formulated anti-
freeze with an ethylene glycol base (SAE J814-C),
an antifreeze with corrosion-inhibiting properties.
Dilute it with soft water to the specified concentra-
tion.
Coolant checking and
replacing
Inspection interval Daily pretrip inspection
Replacement interval Every 24 months
Total hardness 300 ppm or less
Sulfate SO
4
–
100 ppm or less
Chloride Cl
–
100 ppm or less
Total dissolved solids 500 ppm or less
pH 6 to 8
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