Audi R8 42 Coolant Hose Auxiliary Radiator Cooling System 079121057P

Audi R8 42 Coolant Hose Auxiliary Radiator Cooling System is an original component from the Cooling system hoses and pipes group, designed to operate in the demanding thermal environment of a sports engine. Thanks to its factory geometry and correct diameter, it ensures stable coolant flow in the auxiliary circuit, supporting safe heat dissipation from the power unit.

Specifications and technical data

• SKU: 079121057P
• Mark: Audi
• Condition: Used
• OEM Part Number: 079121057P
• Substitutable numbers: 079121057P, 079 121 057 P
• Part type: Hose
• Category: Coolant Hoses

Purpose and function in the cooling system

The auxiliary radiator hose in the Audi R8 42 series is responsible for transporting coolant between the components of the auxiliary cooling circuit. A properly selected hose:

• maintains system tightness at high operating temperatures,
• ensures the appropriate flow cross-section, limiting pressure drops,
• stabilizes the operation of the entire cooling system during dynamic driving. Thanks to its factory fitment to the Audi design, the hose maintains proper routing in the engine bay, minimizing the risk of abrasion and unwanted stress.

Original origin and Audi fitment

The component comes from the original Audi parts line, which means it retains the same material specification, shape, and diameters intended by the vehicle manufacturer. In practice, this translates into:

• secure fitment to connectors and mounts in the cooling system,
• compatibility with the factory layout of components in the engine bay,
• consistency with the operating parameters of the stock Audi R8 42 cooling system. Choosing an original hose reduces the risk of assembly issues, leaks, or improper system operation resulting from the use of random aftermarket replacements.

Performance characteristics of the hose

The auxiliary radiator hose is designed to operate under conditions of high temperature and variable coolant pressure. The hose construction ensures:

• resistance to typical thermal loads occurring in high-power engines,
• shape stability during long-term operation,
• the possibility of direct installation in place of a worn component without modifying the installation. As a used part, the hose is a sensible choice for cooling system maintenance when you want to maintain the original specification at controlled repair costs.

Condition and service application

The product is offered as a used original component, which allows for an economical hose replacement in case of wear, cracks, fractures, or leaks of the existing component. This type of hose is suitable both for standard repairs and for restoring the factory configuration of the cooling system in cars driven dynamically. Before installation, it is recommended to perform a standard check of the cooling system – the condition of the fluid, the tightness of other hoses, and the correct operation of the pump and radiator – to ensure uniform operating conditions for the entire system.

Expanding Audi cooling system service

If you are planning a comprehensive repair or upgrade of the cooling system area in your Audi and need other elements from the same group, such as additional hoses, return lines, or sections connecting the radiator to the engine, check the available parts in the Audi cooling system hoses and pipes category. When working on engine operating temperatures, it is also worth taking care of air conditioning efficiency. If you want to learn when it is worth using an original used compressor instead of a new replacement, check out the article No cooling in the car: original used A/C compressor as a proven alternative, where you will find practical tips on selecting and checking components before installation. If you are planning a broader vehicle service and want to collect various original used parts in one place, the guide Comprehensive supply of used car parts in one place may be helpful, describing the advantages of a One-Stop-Shop approach and how to avoid problematic replacements.