Service manual

CLOSED COOLED MODELS SERVICE MANUAL NUMBER 26
Page 6B-10 90-861329--1 MARCH 1999
4. Check opening and closing temperature of thermostat (using a tester similar to the one
shown), as follows:
a. Fill tester to within 1 in. (25 mm) of top with tap water. Do not use distilled water.
b. Open thermostat valve and insert thread. Position thermostat on nylon string so that
it will be just below water level when suspended, then allow valve to close. Suspend
thermostat in water.
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a
b
c
a-Thermometer
b-Nylon String
c-Thermostat
c. Place thermometer in container and position so that bottom of thermometer is even
with bottom of thermostat. Do not allow thermometer to touch container.
IMPORTANT: When performing instructions “d” and “e,” water must be agitated thor-
oughly to obtain accurate results.
d. Plug in tester and observe temperature at which thermostat opens (thermostat
drops off thread). Thermostat must open at 138-145°F (59-63°C). Thermostat must
be completely open at 170°F (77°C).
e. Unplug tester and allow water to cool to a temperature 10°F (5°C) below specified
temperature on thermostat. Thermostat must be completely closed at this tempera-
ture.
f. Replace a thermostat that fails to meet all of the preceding tests.
Installation
1. Remove thermostat housing and gaskets. Discard gaskets.
2. Clean gasket surfaces on thermostat cover, thermostat housing and intake manifold.
3. Position lower gasket (with continuity rivets) on intake manifold. Place thermostat hous-
ing on gasket.
IMPORTANT: If gasket has continuity rivets, do not coat with Quicksilver Perfect Seal,
or audio warning temperature switch may not work properly.
4. Install thermostat as shown, into thermostat housing.
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Index