Air Injection Vacuum Control Solenoid Valve: Description and Operation

Dual Thermactor Air Control Solenoid Valve:

The Dual Thermactor Air control Solenoid Valve assembly consists of two normally closed solenoid vacuum valves, the thermactor air bypass valve and the thermactor diverter valve (TAB and TAD). When de-energized both are vented, sourced by the intake manifold vacuum reservoir and controlled by an EEC system (Refer to Computerized Engine Controls for diagnostic procedures). Also used on 2 wheel drive/4 wheel drive vehicles and single solenoids for EGR shutoff.