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WSG-1068 COOLING SYSTEM
4. If the engine coolant appearance is good, test
the engine coolant range with the battery and
antifreeze tester:
Maximum ratio is 60/40.
Minimum ratio is 45/55.
5. Check the engine coolant system conditions:
If the engine cooling fluid is low, add
specified coolant mixture only.
If the engine coolant fluid tests weak, add
straight engine coolant until the readings are
within acceptable levels.
If the engine coolant tests strong, remove
some of the engine coolant and add water
until readings are within acceptable levels.
6. Check for electrical charge in coolant. Using a
DVOM, insert the (+) probe into coolant without
touching radiator. Hold the (-) probe to radiator
shell or a good ground and read the volts.:
Less then 1.5 volts is good.
If voltage is above 1.5 volts - drain, flush and
replace coolant with a 50/50 mixture.
NOTE: Above 3 volts may indicate a bad head gasket.
Thermostat Test – Thermostat Removed
WARNING: USE CAUTION WORKING WITH
HOT BOILING WATER AND WEAR APPROPRIATE
PROTECTIVE GEAR. MAY CAUSE BODILY HARM.
Remove the thermostat and immerse it in boiling water.
Replace the thermostat if it does not open at least 0.230"
after one minute at 212°F.
If the problem being investigated is the inability of the
cooling system to reach normal operating temperature,
the thermostat should be checked for leakage. This
may be done by holding the thermostat up to a lighted
background. Leakage of light all around the thermostat
valve (thermostat at room temperature) indicates that
the thermostat is unacceptable and should be
replaced. It is possible, on some thermostats, that a
slight leakage of light at one or two locations on the
perimeter of the valve may be detected. This should be
considered normal.
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