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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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