Ford Mondeo Mk4 Power Steering Pipe Hose Line Expansion Tank Hose 6G91-3691-AB

Ford Mondeo Mk4 Power Steering Pipe Hose Line Expansion Tank Hose is a component from the Pipes, hoses and lines group, responsible for the proper circulation of fluid in the power steering system. A properly selected hose ensures stable operating pressure, reduces the risk of air entering the system, and supports the uniform operation of the expansion tank, which translates into predictable and safe vehicle handling.

Specifications and technical data

• SKU: 6G91-3691-AB
• Mark: Ford
• Condition: Used
• OEM Part Number: 6G91-3691-AB
• Substitutable numbers: 6G91-3691-AB, 6G913691AB, 6G91-3691-AC, 1701461
• Part type: Hose
• Category: Hoses, Lines & Pipes

Purpose and function in the power steering system

The described hose has been designed specifically for the power steering system in the fourth-generation Ford Mondeo, where it is responsible for transporting fluid between the expansion tank and other hydraulic components. A properly selected and leak-free hose reduces pressure drops, minimizes the risk of leaks, and helps maintain stable operating parameters for the pump and steering gear.

Thanks to its dedicated geometry and internal diameter, the hose ensures:

• proper fluid flow under typical operating conditions,
• reduction of cavitation and fluid foaming in the expansion tank,
• consistent steering assistance performance during parking maneuvers and highway driving.

Construction and fitment for Ford Mondeo Mk4

The hose is a component structurally matched to the factory Ford steering system, which facilitates installation at the original mounting points. Properly shaped flexible and rigid sections allow for collision-free routing of the hose in the engine bay, while maintaining the required bending radii and clearance from heat-generating components.

Such fitment translates into:

• stable positioning of the hose during engine operation and body vibrations,
• reduction of stress at connection points,
• reduced risk of abrasion and mechanical damage in the long term.

Characteristics of the used component

The offered hose comes from the secondary market, which means it is a used part intended for further use after proper installation. This type of component is a good choice for power steering system maintenance when you want to maintain the original manufacturer's specifications while optimizing repair costs.

When installing a used hose, it is recommended to:

• check the condition of connectors and clamps before installation,
• use fresh fluid that complies with the vehicle manufacturer's specifications,
• bleed the system after starting the engine and performing full steering turns.

Benefits of using an original hose

Using a hose dedicated to the Mondeo Mk4 allows you to maintain the factory operating parameters of the power steering system. The original geometry and diameter of the hose promote uniform fluid flow, which helps reduce pump noise, steering wheel vibrations, and sudden changes in steering assistance force. This is particularly important during daily city driving, where the system works intensively.

For the user, this means more predictable vehicle behavior, better control over the driving path, and less load on other steering system components.

Technical support and related system components

If you want to better understand how the steering and hydraulic power steering system works, as well as the typical symptoms of wear in hoses, pumps, or gears, it is worth checking out practical technical materials. An extended discussion on construction, diagnostics, and operation can be found in the article Steering system and power steering – how it works and what breaks?, which will help you choose the right service strategy.

If you are planning a comprehensive repair or upgrade of the hydraulic power steering area in your Ford and need other components from the same group, such as flexible return hoses, rigid pressure pipes, or sections connecting the tank to the pump, check out the available parts in the category Ford pipes, hoses and lines.