03-68 Auxiliary Systems
03-68
COOLING SYSTEM, DIAGNOSING AND TESTING (Continued)
Thermostat Test
-Thermostat Removed
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 the 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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