Audi A4 S4 B8 A5 S5 8T Radiator Coolant Hose Tube Pipe Line 3.0 TFSI 8K0145923B

Audi A4 S4 B8 A5 S5 8T Radiator Coolant Hose Tube Pipe Line 3.0 TFSI 8K0145923B is an original component from the Cooling system hoses and pipes group, designed to operate in the demanding environment of the 3.0 TFSI engine. Engineered by the vehicle manufacturer, it ensures stable coolant flow and proper integration with other system components.

Specifications and technical data

• SKU: 8K0145923B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0145923B
• Substitutable numbers: 8K0145923B, 8K0 145 923 B
• Part type: Line
• Category: Coolant Hoses

Purpose and function in the cooling system

The radiator hose in the 3.0 TFSI engine is responsible for the controlled flow of fluid between key system components, which helps maintain a stable operating temperature for the powertrain. For Audi A4 / S4 B8 and A5 / S5 8T models, a correctly selected hose is essential for:

• maintaining proper pressure in the cooling circuit,
• reducing the risk of engine overheating under higher loads,
• ensuring tight connections with the radiator and other system components.

Thanks to its factory geometry, the hose maintains the correct routing in the engine bay, which minimizes stress and reduces the risk of abrasion during operation.

Benefits of using an original Audi hose

Using a hose from the same design line as the rest of the cooling system translates into a number of practical advantages. In terms of service and usage, the following are particularly important:

• precise fit to the connectors and mounts in the engine bay,
• preservation of the factory inner diameter, which supports proper fluid flow,
• compatibility with original clamps and mounting brackets,
• consistency with the cooling system operating parameters specified by the manufacturer.

Choosing a component from this group allows you to reduce the risk of leaks, which often occur when using random replacements with different geometry or rigidity.

Characteristics of the used component

The offered hose comes from disassembly and has the status of a used original part. For many users, this is a reasonable compromise between cost and maintaining the factory part specification. In practice, this means:

• preservation of the original design intended for the 3.0 TFSI engine,
• the possibility of economical cooling system repair while maintaining compliance with the manufacturer's design,
• easier identification and selection compared to universal hose sections.

Before installation, a standard visual inspection and replacement of the clamps are recommended to ensure connection tightness after installation in the vehicle.

Technical support and selection in the Audi cooling hose group

In the case of extensive cooling system intervention – for example, when replacing the radiator, water pump, or additional hoses – it is worth treating this element as part of the entire system. If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional hoses, return lines, or sections connecting to the oil cooler, check the available parts in the Audi cooling system hoses and pipes category.

More about cooling system operation

In turbocharged engines, such as the 3.0 TFSI, the condition of the hoses and radiator has a direct impact on the durability of the powertrain, especially during periods of high ambient temperatures. To better plan your service and understand how used components can help optimize costs, it is worth checking out our guide "Summer heat vs. cooling system: used radiators and fans as a guarantee of savings", where we discuss the practical aspects of operating and selecting cooling system components.