Audi S5 8T 4.2 FSI CAUA Engine Coolant Hose Pipe Line Tube 8K0121164R

Audi S5 8T 4.2 FSI CAUA Engine Coolant Hose Pipe Line Tube is an original component from the Cooling system hoses and pipes group, designed to operate in the demanding environment of a gasoline engine. This used OEM component ensures proper coolant flow, stabilizing engine operating temperature and supporting safe thermal load during dynamic driving.

Specifications and technical data

• SKU: 8K0121164R
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0121164R
• Substitutable numbers: 8K0121164R, 8K0 121 164 R
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and function in the cooling system

This hose is a part of the coolant flow path in a gasoline engine, responsible for directing the medium between specific system components. A correctly selected and installed hose reduces the risk of local overheating, supports uniform heat dissipation, and stabilizes the engine's operation across the full range of loads.

Thanks to a design tailored to the specific engine configuration, the hose maintains proper geometry under the hood, minimizing stress, the risk of abrasion, and unwanted vibrations during operation.

Benefits of using an original cooling hose

Using an original hose in the cooling system provides a number of practical technical benefits:

• preservation of the factory geometry for coolant routing in the engine bay,
• properly selected material stiffness and flexibility relative to operating temperature,
• compatibility with cooling system connectors and mounts,
• reduction of the risk of leaks resulting from poorly fitted aftermarket parts.

For gasoline engines, a stable operating temperature is particularly important, which is why a functional cooling system hose has a direct impact on engine durability, accessory performance, and thermal safety at higher speeds and loads.

Characteristics of the used component

The offered hose comes from disassembly and is a used component, which allows for economical repair while maintaining the manufacturer's original specifications. This type of solution is particularly beneficial when servicing older vehicles, where both technical compliance and rational vehicle maintenance costs are important.

Choosing a used OEM component from the Cooling system hoses and pipes group is a compromise between price and structural fit, which in many cases works better than random replacements with uncertain parameters.

Technical support and knowledge about the cooling system

When replacing a cooling hose, it is worth paying attention to the overall condition of the system: the tightness of connections, the condition of the radiator, the operation of the fans, and the quality of the coolant itself. A comprehensive approach to service helps avoid recurring failures and ensures stable engine operation in high ambient temperatures.

If you want to better understand how summer conditions affect the entire heat dissipation system and how to reasonably use components from disassembly, check out our guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings.

Related Audi cooling system components

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 radiator, check out the available parts in the Audi cooling system hoses and pipes category.