Ford Focus St-3 Mk3 Engine Thermostat Hose Tube Line Pipe AG9E-8A582-AD

Ford Focus St-3 Mk3 Engine Thermostat Hose Tube Line Pipe is an original cooling system component designed for precise coolant routing between the thermostat and other engine components. Thanks to its factory geometry and fitment specifically for the Focus St-3 Mk3 model, it ensures stable thermal conditions for the power unit and predictable engine behavior across a wide range of loads. This is a solution for users who expect consistency with the factory cooling system design and want to avoid issues with leaks or improper fluid circulation.

Specifications and technical data

• SKU: 2377793
• Mark: Ford
• Condition: Used
• OEM Part Number: 2377793
• Substitutable numbers: 2377793, AG9E-8A582-AD, AG9E8A582AD
• Part type: Hose
• Category: Coolant Hoses

Technical characteristics of the thermostat hose

The hose belongs to the Cooling system hoses and pipes group, which means it is responsible for the tight and directional flow of coolant in the critical area near the thermostat. The design is matched to the ST-3 Mk3 engine system, maintaining the correct diameters, bend angles, and working length, in order to:

• maintain proper coolant flow under high engine loads,
• minimize the risk of turbulence and local pressure drops in the circuit,
• ensure compatibility with factory clamps and thermostat connectors. A properly selected hose in this part of the cooling system has a direct impact on the stability of the engine's operating temperature, which translates into its durability and repeatable performance.

Purpose and fitment for Ford Focus ST-3 Mk3

This hose has been designed specifically for the sporty Ford Focus ST-3 Mk3 variant, where the power unit often operates under higher loads than in standard versions. Using the correct component in the thermostat area allows you to:

• maintain a stable operating temperature during dynamic driving,
• reduce the risk of overheating in city and highway conditions,
• preserve the factory thermostat response characteristics. As a result, this hose is particularly recommended when replacing worn or leaking cooling system components, as well as after engine modifications that increase thermal load.

Benefits of using an original Ford hose

Choosing a component from the Ford brand means maintaining compliance with the vehicle's factory design. In practice, this translates into:

• secure fitment to connectors and mounts in the engine bay,
• appropriate hose flexibility while maintaining the required rigidity,
• consistency with other Ford Focus ST-3 Mk3 cooling system components. Such a solution is particularly important in high-performance cars, where the cooling system operates under more demanding conditions, and every element must work with the others without additional stress or leaks.

Component condition and service application

The offered hose comes from the used parts group, making it an attractive cost-effective alternative while maintaining the original design specifications. This type of component will work well both for standard replacement of a worn hose and for repairs after a cooling system failure, where restoring proper fluid circulation quickly is key. Before installation, standard service procedures are recommended: checking the condition of connectors, clamps, and the tightness of the entire circuit after filling and bleeding the system. A properly selected and installed thermostat hose helps reduce the risk of leaks and improper thermostat operation.

Technical support and additional information

To better understand the impact of hoses and pipes on the operation of the entire cooling circuit, it is worth reading practical tips on diagnostics and cooling system service, which you can find in the article Engine cooling system – overheating, repair, and used radiators. This will allow you to consciously plan maintenance and the potential replacement of other components related to the thermostat. If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other elements from the same group, such as radiator hoses, return hoses, or sections connecting to the heater core, check the available parts in the Ford cooling system hoses and pipes category.