Ford Focus Mk3 Air Condition Heat Water Pipe Hose Line Tube F1F1-18K580-XA

Ford Focus Mk3 Air Condition Heat Water Pipe Hose Line Tube is an original thermal system component responsible for the stable flow of the water-based medium between the air conditioning and heating modules. Thanks to its factory geometry and precise connection diameters, the hose ensures proper compatibility with original Ford equipment, which translates into predictable performance of the interior cooling system. This is a practical solution for users who want to maintain consistency with the factory design of the Focus Mk3 and avoid issues with fitting aftermarket replacements.

Specifications and technical data

• SKU: 1870390
• Mark: Ford
• Condition: Used
• OEM Part Number: 1870390
• Substitutable numbers: F1F1-18K580-XA, F1F118K580XA, 1870390
• Category: A/C Hoses & Fittings

Purpose and function in the air conditioning system

The air conditioning and heating water hose in the Ford Focus Mk3 operates in the heat exchange area between the heater core, air conditioning system components, and the rest of the cooling installation. It is responsible for:

• stable routing of the working medium towards the heater core and back,
• maintaining connection tightness under varying temperature conditions,
• preserving the correct operating pressure within the circuit. Thanks to its factory profile and properly selected ends, the hose works with original connectors, which reduces the risk of leaks and improper positioning in the engine bay.

Construction and fitment for Ford Focus Mk3

The offered item belongs to the Air conditioning hoses, pipes, and connectors group, meaning it has been designed to operate in a high-temperature environment and in contact with coolant. The hose construction accounts for:

• a properly shaped routing path in the engine bay,
• integrated flexible and rigid sections (depending on the version),
• locations for factory mounts and brackets. Such a solution facilitates installation and allows for maintaining the original routing of the installation, which is important for both service and subsequent diagnostics of potential faults.

Benefits of using an original Ford hose

Using an original air conditioning and heating water hose in the Focus Mk3 allows for maintaining system performance parameters at the level intended by the manufacturer. In practice, this means:

• secure fitment to cooling and air conditioning system ports and connectors,
• preservation of the factory hose routing, without tension or twisting,
• easier part identification thanks to OEM markings and interchangeable numbers in the specification. For workshops and users, this means a lower risk of returns, as well as faster installation without the need for modifications or the use of additional adapters.

Condition, verification, and service application

The item comes from the Ford range and is intended for reinstallation in vehicles where restoring the correct water circulation in the air conditioning and heating system is required. In practice, the hose will prove useful during:

• repairs after a cooling system or heater core failure,
• fixing leaks within water lines,
• comprehensive air conditioning system maintenance combined with heater service. Due to the preservation of the original specification, this is a particularly beneficial solution where compliance with service documentation and predictable system behavior after repair are important.

Technical support and related system components

When selecting a hose, it is worth verifying the OEM markings and interchangeable numbers in the technical specification section to match the item to the specific engine version of the Focus Mk3. If you have doubts regarding complete cooling and air conditioning system diagnostics, a service guide will be helpful – more practical tips can be found in the article No cooling in the car: an original used air conditioning compressor as a proven alternative to expensive new parts, which discusses, among other things, the principles of selecting OEM components and inspecting the installation before assembly. If you are planning a comprehensive repair or upgrade of the air conditioning zone in your Ford and need other items from the same group, such as additional pipes, flexible hoses, or service connectors, check the available parts in the Ford air conditioning hoses, pipes, and connectors category.