BMW 1 3 Series F20 F21 F30 LCI M140i 340i Radiator Return Pipe Line 8630023

BMW 1 3 Series F20 F21 F30 LCI M140i 340i Radiator Return Pipe Line is an original BMW cooling system component, designed for precise coolant routing between the radiator and other engine components. This used part from the Cooling system pipes and hoses category allows for a cost-effective yet technically correct repair of the factory cooling system in selected F-series models.

Specifications and technical data

• SKU: 8630023
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8630023
• Substitutable numbers: 11538630023, 8630023
• Category: Coolant Hoses

Technical specifications and intended use

The presented radiator return pipe has been designed as a component of the factory cooling system in BMW F-series models, such as the F20, F21, and F30 in M140i and 340i versions. It is responsible for stable, leak-proof, and directional coolant flow, which directly impacts the maintenance of the proper operating temperature of the engine unit.

Thanks to its OEM-compliant design, the pipe maintains the correct geometry, connection diameters, and mounting points, which facilitates installation in place of the factory component and reduces the risk of leaks or stress in the system.

Role in the BMW cooling system

A functional radiator pipe in the BMW F20, F21, and F30 is crucial for:

• maintaining a stable flow of coolant between the radiator and the engine,
• ensuring proper pressure within the cooling system,
• reducing the risk of engine overheating under load,
• preserving the factory performance characteristics of the M140i and 340i engines.

Choosing an original pipe from this group ensures compatibility with other cooling system components, such as the radiator, connectors, or quick-release couplings, without the need for modifications.

Benefits of using an original BMW pipe

Using an original radiator return pipe in a BMW F-series vehicle provides a number of practical service and operational benefits:

• Factory fitment – compatibility with the original mounting system and routing in the engine bay is maintained.
• Stable cooling system operation – the correct cross-section and shape of the pipe support proper coolant circulation.
• Reduced risk of failure – replacing a worn or damaged pipe reduces the risk of leaks and sudden drops in fluid levels.
• Consistency with other OEM elements – the pipe works with factory clamps, connectors, and brackets specified by the manufacturer.

Part condition and service application

This item comes from the used parts group, which allows for cost-effective restoration of the cooling system's efficiency while maintaining the original BMW specification. This type of pipe is particularly useful for repairs following fluid leaks, mechanical damage in the engine bay, or when replacing the radiator, where it is necessary to restore the complete flow path.

Due to its specific fitment for the F20, F21, and F30 models in M140i and 340i versions, the part is suitable for both routine repairs and more extensive service work related to the cooling system.

Technical support and additional materials

To better understand the impact of a functional radiator pipe on engine durability and the symptoms of overheating, it is worth checking out the guide on our blog: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of diagnostics and cooling system service in popular models.

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other components from the same group, such as additional pipes, return hoses, or sections connecting to the radiator, check out the available parts in the BMW cooling system pipes and hoses category.