Dual Air Control Solenoids

The by-pass/diverter valve operation is controlled by two solenoid valves: Thermactor Air By-Pass (TAB) valve, and Thermactor Air Diverter (TAD) valve. The valves are mounted on top of the right hand fender apron.

The TAB solenoid valve controls manifold vacuum to the by-pass portion of the by-pass/diverter valve, which in turn controls whether air from thermactor pump is by-passed to the atmosphere (solenoid de-energized) or routed to control the diverter valve (solenoid energized).

The TAD solenoid valve controls manifold vacuum to the diverter portion of the by-pass/diverter valve, which in turn controls which direction (upstream or downstream) thermactor air is routed. In the de-energized position, air is routed downstream. In the energized position, air is routed upstream.