Ford Thermactor Combination Valve Diagram - Air Bypass/Control Ports Labeled

This document is a labeled line drawing of a Thermactor secondary air system combination (bypass/diverter) valve, as used in Ford emissions systems. The illustration identifies six key features of the valve with callout arrows: the inlet from the air pump (the large upper tube), vacuum port "S" for air control (a small nipple on top of the diaphragm housing), outlet "B" to catalyst (side tube), outlet "A" to engine (bottom tube), vent holes in the valve body, and vacuum port "D" for air bypass (small nipple on the bypass diaphragm at left). The diagram lets a reader identify which hose or tube connects where when servicing or diagnosing the secondary air injection (Thermactor) system: pressurized air enters from the air pump and is routed either to the exhaust manifold/engine (outlet A), to the catalytic converter (outlet B), or vented/bypassed, depending on the vacuum signals applied to ports S and D. It contains no part numbers, torque specs, year/model statements, or test procedures — it is purely a component identification drawing useful for correctly connecting vacuum lines and air tubes on the combination valve.