CLOSED COOLING SYSTEM SERVICE MANUAL NUMBER 22
Page 6B-24 90-860074--1 FEBRUARY 2002
4. Following the manufacturers recommendations for usage, check opening and closing
temperature. The thermostat opens when it drops off of thread using a tester.
Thermostat must open at specified temperature stamped on thermostat.
72675
a
b
c
Typical Thermostat Tester In Use
a-Thermometer
b-Nylon String
c-Thermostat
IMPORTANT: Refer to specifications and note that the two thermostats have different
opening temperatures.
5. Continue to heat water until a temperature 14 degrees C (25 degrees F) above opening
temperature is obtained. Thermostat valve must be completely OPEN at this
temperature.
6. Unplug tester and allow water to cool to a temperature 5 degrees C (10 degrees F) below
specified opening temperature. The thermostat must be completely CLOSED at this
temperature.
7. Always replace a thermostat that fails to meet all of the preceding tests with one of the
same temperature specification.
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