Fleetwood FWD V8-252 4.1L (1986)
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Fig. 28 Choke Break Thermal Vacuum Switch (CB-TVS). 3 port type
3 Port Type
When engine coolant temperature is below the switching point, vacuum should pass through ports 1 and 2, Fig. 28. When engine coolant temperature
is above the switching point, vacuum should pass through ports 1 and 3, Fig. 28.