BMW G01 G02 G05 G06 G07 G11 LCI G20 Heat Thermostat Housing M40i B58D 8642559

BMW G01 G02 G05 G06 G07 G11 LCI G20 Heat Thermostat Housing M40i B58D is an original component from the Thermostats and housings group, designed for the cooling system of modern BMW B58D series engines in the M40i version. This used, factory-made housing ensures proper coolant flow and stable thermostat operation, which translates into safe engine operating conditions. It is a solution for users looking for OEM parts with proven geometry and fitment for specific generations of the BMW G-series.

Specifications and technical data

• SKU: 8642559
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8642559
• Substitutable numbers: 11538642559, 8642559
• Part type: Thermostat Housing
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing in the B58D M40i engine is responsible for the precise seating of the component that regulates the engine's operating temperature and for the leak-proof routing of coolant between the engine block and other system components. In BMW G01, G02, G05, G06, G07, G11 LCI, and G20 models, a properly selected housing is crucial for:

• maintaining a stable engine operating temperature across a wide range of loads,
• reducing the risk of engine overheating or undercooling,
• ensuring connection tightness and proper coolant circulation,
• preserving the factory operating parameters of the cooling system. Thanks to a design consistent with BMW's engineering, the housing works with stock connectors, hoses, and sensors, which facilitates installation and subsequent operation.

Benefits of using an original BMW thermostat housing

Using an original thermostat housing in the M40i B58D engine allows you to maintain the factory characteristics of the cooling system. In practice, this means:

• reliable fitment to the cylinder head and accessories – no need for modifications or adjustments,
• compatibility with factory mounting points and seals,
• preservation of the coolant flow rates designed by the manufacturer,
• lower risk of leaks compared to aftermarket replacements with different geometry. For high-performance units such as the M40i versions, a properly functioning cooling system has a direct impact on engine durability, performance stability, and operational safety under higher loads.

Condition, verification, and preparation for installation

The offered BMW thermostat housing comes from dismantling and has the status of a used original component. Before being offered for sale, the part is visually inspected for mechanical damage in the area of mounts, connectors, and mating surfaces. As a result, the user receives a component suitable for further use after applying appropriate new seals in accordance with the manufacturer's guidelines. During installation, it is recommended to:

• thoroughly clean the contact surfaces on the block or cylinder head,
• use new gaskets and fasteners in accordance with BMW service documentation,
• properly bleed the cooling system after replacement.

Application in the BMW G-series model range

The housing was designed to work with the B58D M40i unit used in selected BMW G-series models, such as SUVs and luxury sedans. This makes it particularly interesting for users who drive their cars dynamically and expect stable cooling system performance in various road conditions. The factory design ensures compatibility with stock engine accessories and the temperature control system.

Expanding the BMW cooling system – related components

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional housings, bodies, or temperature control modules, check out the available parts in the BMW Thermostats and housings category. If you are considering a wider use of aftermarket components, including electronic elements that work with the drivetrain and comfort systems, the article describing best practices for selecting used modules and controllers may be helpful – you can find more information in the material Second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.

Summary

BMW G01 G02 G05 G06 G07 G11 LCI G20 Heat Thermostat Housing M40i B58D is an original cooling system component that allows you to restore proper thermostat operation and maintain the engine's factory temperature parameters. The used OEM housing is a technically sound choice for drivers who value compatibility with factory equipment, predictable engine behavior, and reasonable service costs while maintaining high manufacturing quality.