Ninety-Eight FWD V6-260 4.3L DSL (1985)
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Thermostatic Air Cleaner Vacuum Switch: Description and Operation
This switch acts as a vacuum connection for the thermac air cleaner control and a thermal control for the secondary vacuum break diaphragm. Ports 1
and 2 of this switch are always connected and port 3 is sealed when cold and connected to the other ports when warm.