CLOSED COOLING SYSTEM
SERVICE MANUAL NUMBER 22
90-860074-1 FEBRUARY 2002 Page 6B-23
6. Remove thermostats.
73973
a
b
c
d
a-Thermostat Housing Cover
b-Thermostat(s)
c-Gasket
Testing
1. Clean thermostats in soap and water to remove any deposits or debris.
2. Inspect thermostats for corrosion or other visible damage.
3. If thermostats are suspected of producing insufficient engine temperature, check
thermostats for leaks by holding them up to lighted background. Light leaking around
the thermostat valve indicates that thermostat is not closing completely and should be
replaced. A few light leaks at one or two points around the valve perimeter is acceptable.
72717
a
a-Perimeter of Valve
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