What components are labeled in this 1990 Bronco 4.9L emissions diagram?

The diagram labels two check valves, the combination air control valve, and the air pump, plus an arrow indicating the front of the engine.

Where is the air pump located according to this diagram?

The air pump is shown mounted low toward the front of the engine, connected by a large hose that runs up to the combination air control valve.

How many check valves does this secondary air system diagram show?

Two check valves are shown — one at the upper rear/right side of the engine and one on a hose at the left/front side.

Where is the combination air control valve in this diagram?

It is shown at the rear/side of the engine, at the junction where the air pump hose and the hoses leading to the two check valves meet.

What is the reference number on this diagram?

The drawing carries the illustration reference number A13526-A.

Home/ Registry/ Ford/ Bronco/ 1987-1991/ “Eddie Bauer”/ Photo supermotors.net/registry/media/988500

1990 Ford Bronco 4.9L MT Thermactor Air Pump & Check Valve Diagram (A13526-A)

Engine diagram with check valves, combination air control valve and air pump

‹ ›

Secondary air schematic showing the check valves, combination air control valve and air pump routing on a V-engine.

AI caption July 2013 · Photo 1562 of 1799

This document is a Ford factory-style line drawing (illustration reference number A13526-A) showing the layout of the Thermactor secondary air injection (emissions) system on an engine, uploaded as applying to a 1990 Ford Bronco 4.9L with manual transmission. The perspective view shows the engine with its intake manifold and accessory drive area, with an arrow indicating 'FRONT OF ENGINE' for orientation. Four callouts identify the emissions components and their locations: two CHECK VALVES (one at the upper right rear of the engine near a hose connection with a clamp, and one at the left side on a hose running forward along the engine), the COMBINATION AIR CONTROL VALVE mounted at the rear/side of the engine where several air hoses join, and the belt-driven AIR PUMP mounted low at the front of the engine. The routing of the air supply hoses between the air pump, combination air control valve, and the two check valves is depicted graphically. A reader can use this diagram to identify each secondary air (Thermactor) component, verify correct hose routing, and locate the check valves and combination valve for inspection or replacement.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What components are labeled in this 1990 Bronco 4.9L emissions diagram?: The diagram labels two check valves, the combination air control valve, and the air pump, plus an arrow indicating the front of the engine.
Where is the air pump located according to this diagram?: The air pump is shown mounted low toward the front of the engine, connected by a large hose that runs up to the combination air control valve.
How many check valves does this secondary air system diagram show?: Two check valves are shown — one at the upper rear/right side of the engine and one on a hose at the left/front side.
Where is the combination air control valve in this diagram?: It is shown at the rear/side of the engine, at the junction where the air pump hose and the hoses leading to the two check valves meet.
What is the reference number on this diagram?: The drawing carries the illustration reference number A13526-A.