BMW G30 G31 G32 G11 G12 Coolant Expansion Tank Hose Pipe Line 8602602

BMW G30 G31 G32 G11 G12 Coolant Expansion Tank Hose Pipe Line is an original cooling system component designed for the precise drainage and return of coolant between the radiator and the expansion tank. Thanks to its factory geometry and precise fit for specific BMW generations, it ensures stable engine thermal conditions and the proper operation of the entire cooling system. This used OEM part is a sensible choice for drivers looking for a proven component at an attractive price.

Specifications and technical data

• SKU: 8602602
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8602602
• Substitutable numbers: 17128602602, 8602602
• Part type: Hose
• Category: Coolant Hoses

Function and role of the hose in the cooling system

The expansion tank hose in BMW G30, G31, G32, G11, and G12 series models is responsible for the controlled flow of coolant between the radiator and the expansion tank. A correctly selected component:

• maintains proper pressure in the cooling system,
• prevents local overheating and air locks in the circuit,
• stabilizes the coolant level in the expansion tank,
• reduces the risk of leaks in the critical section between the radiator and the tank.

Thanks to its factory profile, the hose is designed to be routed in the engine bay in a way that prevents rubbing against other components and maintains the correct bending radius, which is crucial for long-term tightness and vibration resistance.

Why choose an original BMW hose

The original BMW coolant expansion tank hose has been designed specifically for the cooling system of the listed body generations. In practice, this means:

• a secure fit to the radiator and expansion tank connectors,
• compatibility with factory mounts and routing in the engine bay,
• material selected for operation at high temperatures and under variable pressure,
• maintenance of flow parameters specified by the manufacturer.

Compared to random aftermarket replacements, the original cooling system component reduces the risk of leaks, improper hose positioning, or collisions with other sub-assemblies. This is particularly important in modern BMWs, where the engine bay is densely packed and assembly tolerances are tight.

Used condition – practical benefits and application

The presented hose comes from disassembly and has the status of a used part. For many users, this is a beneficial solution because:

• it allows for lower repair costs while maintaining original build quality,
• it ensures compatibility with the factory cooling system specification,
• it enables the replacement of a damaged or worn-out hose without investing in expensive new parts.

When replacing the hose, it is worth checking the condition of other cooling system components – the radiator, expansion tank, clamps, as well as the level and quality of the coolant. A correctly selected and installed hose helps maintain stable operating temperature of the engine unit, which translates into its durability.

Part selection by OEM and replacement numbers

This hose model belongs to the Cooling system hoses and pipes group, and its identification is based on the OEM number and available replacement numbers. In practice, this means the possibility of precisely matching the component to a specific engine version and vehicle year, without the risk of assembly errors. If you need support in choosing between an original part, a replacement, or a disassembled component, the following article will be helpful: which parts – original, replacement, or used – are the most cost-effective.

Cooling system operation and driving comfort

A functional coolant expansion tank hose affects not only the protection of the engine against overheating but also the comfort of using the car – a stable operating temperature promotes the proper operation of air conditioning, interior heating, and control electronics. In case of problems with cabin cooling or lack of cooling on the air conditioning side, it is worth checking the guide: lack of cooling in the car – when is it worth choosing an original used air conditioning compressor.

Summary

BMW G30 G31 G32 G11 G12 Coolant Expansion Tank Hose Pipe Line is an original, used cooling system component that allows for restoring the proper circulation of fluid between the radiator and the expansion tank in modern BMW models. Factory fit, compatibility with mounts and flow parameters, and the ability to identify by OEM number make it a sensible choice for repairs and cooling system service, especially when balancing quality with cost control.