Ford 5.8L Secondary Air (Thermactor) System Diagram - Component Locations

This document is a two-part factory-style schematic illustrating the secondary air injection (Thermactor) system component locations on a Ford 5.8L V8 engine. The upper illustration shows the complete engine assembly with callouts identifying the Air Diverter (AIRD) Valve (noted as hidden), the Air Bypass (AIRB) Valve, the Secondary Air Dump Silencer, the Air Pump Inlet Silencer/Filter, and the Pump Assembly, with an arrow indicating the front of the engine for orientation. The lower illustration shows a close-up of the intake manifold area, identifying the Air Control Valve and the Check Valves, again with a 'Front of Engine' orientation arrow. Figure reference numbers A9394-D and A15876-A appear on the upper and lower diagrams respectively. A reader can use this document to locate and identify each secondary air/emissions component on the 5.8L engine for inspection, diagnosis, or replacement — for example, finding where the AIRB and AIRD valves sit relative to the air pump, or where the check valves attach near the intake manifold. The diagram contains no torque specifications, wire colors, part numbers for replacement components, or hose routing text beyond the labeled callouts.