Ford Focus ST Mk3 Water Coolant Thermostat Housing 2.0 Petrol CJ5E-8575-AA

Ford Focus ST Mk3 Water Coolant Thermostat Housing 2.0 Petrol is a component from the Thermostats and housings category, designed for the 2.0 petrol engine cooling system in the sporty ST version. It is responsible for the stable flow of coolant and proper interaction with the thermostat, which translates into a safe operating temperature for the engine unit and predictable performance.

Specifications and technical data

• SKU: 5157411
• Mark: Ford
• Condition: Used
• OEM Part Number: 5157411
• Substitutable numbers: 5157411, CJ5E8575AA, CJ5E-8575-AA
• Fuel type: Petrol
• Part type: Thermostat Housing
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing in the Ford Focus ST Mk3 with a 2.0 petrol engine plays a key role in managing the flow of coolant between the engine block, radiator, and return hoses. A properly selected component ensures:

• stable maintenance of the engine's operating temperature,
• proper interaction with the thermostat and temperature sensors,
• a tight connection with the cooling hose system,
• reduction of the risk of engine overheating or undercooling. For the 2.0 petrol engine in the ST version, the correct operation of the cooling system has a direct impact on the durability of the unit, power stability, and safety during dynamic driving.

Technical characteristics and fitment

The presented housing belongs to the Thermostats and housings category, which means it has been designed to work with the factory thermostat and the cooling system intended for the Ford Focus ST Mk3. The design of the component is adapted to:

• the geometry of the cylinder head and petrol engine block,
• the layout of the coolant hose connectors and ports,
• the mounting location in the engine bay of the ST version. Thanks to this, the housing allows for installation in place of the factory component without the need for modifications, which facilitates service and shortens repair time.

Condition, application, and benefits of installation

The component comes from a group of used parts, which allows for an economical repair of the cooling system while maintaining the correct fit for the specific engine version. Replacing the thermostat housing is particularly recommended when the following occur:

• coolant leaks in the area of the thermostat,
• cracks or deformations of the housing body,
• problems with bleeding the cooling system. Selecting the correct housing for the 2.0 petrol unit in the Focus ST Mk3 helps restore proper coolant circulation, reduce the risk of thermostat failure, and stabilize the engine operating temperature during both daily and more dynamic use.

Technical support and additional information

Before purchasing, it is worth verifying the compatibility of the housing with the specific equipment version and model year of the Ford Focus ST Mk3, especially regarding the type of petrol engine and cooling system configuration. In case of doubt, it is helpful to compare the shape of the body and the layout of the connectors with the currently installed component, which minimizes the risk of mismatch. If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other components from the same group, such as housings, inserts, or integrated connectors, check the available parts in the Ford Thermostats and housings category. For drivers interested in a broader view of engine operation and optimizing service costs using used parts, an article comparing popular Volkswagen engines may be useful – Volkswagen 1.9 TDI vs 1.4 TSI – evolution of VW engines and repair costs, which shows how the proper selection of components affects durability and the user's budget.