Grand Marquis V8-302 5.0L VIN F TBI (1984)
Air Injection Vacuum Control Solenoid Valve: Description and Operation
The dual thermactor air control solenoid valve assembly consists of two normally closed solenoid vacuum valves (TAB and TAD), one controlling the
thermactor air bypass valve and the other controlling thermactor diverter valve operation. Both are vented when de-energized and is sourced by the
intake manifold vacuum reservoir and controlled by the EEC-IV system.
