Ninety-Eight FWD V6-181 3.0L (1985)
Thermal Vacuum Valve - Carb: Description and Operation
Choke Vacuum Break Distributor Thermal Vacuum Switch
This switch is located in the air cleaner and permits the choke to run richer below the switching point, then to the leanest point above the switching
point. The distributor vacuum advance receives full manifold vacuum below the switching point of the CVB-DTVS. When temperatures exceed the
calibration value of the switch, manifold vacuum is directed to the thermostatic air cleaner and choke vacuum break ports while the port to the vacuum
advance is blocked, preventing distributor advance above the switching point.
