Audi RSQ3 F3 RS3 8Y 8V Coolant Water Breather Hose Pipe Tube Line 8V0121372

Audi RSQ3 F3 RS3 8Y 8V Coolant Water Breather Hose Pipe Tube Line is an original component from the Lines, hoses and pipes group, designed for cooling systems in Audi sports models with petrol engines. Designed as an OEM part, it ensures proper discharge of excess fluid and air from the system, which promotes stable operating temperatures for the power unit.

Specifications and technical data

• SKU: 8V0121372
• Mark: Audi
• Condition: Used
• OEM Part Number: 8V0121372
• Substitutable numbers: 8V0121372, 8V0 121 372
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The coolant water breather hose in RSQ3 F3 and RS3 8Y and 8V generation models is responsible for the controlled discharge of air and excess fluid from the cooling circuit. A properly functioning hose:

• reduces the risk of air locks in the system,
• supports the maintenance of a stable operating temperature for the petrol engine,
• facilitates the bleeding process after cooling system maintenance,
• ensures predictable system behavior under high thermal loads.

Thanks to its fitment to the specific engine bay architecture of Audi sports models, the hose maintains the correct routing and geometry, which minimizes stress and the risk of abrasion.

Construction, fitment and installation

As an original Audi component, the breather hose is structurally adapted to factory connectors and brackets in the cooling system. The appropriately selected diameter, shape, and mounting points allow for:

• trouble-free installation in place of the factory component,
• proper routing of the hose in the engine bay,
• maintenance of connection tightness under variable temperatures and pressures.

Such fitment limits the need for modifications and helps maintain the factory performance parameters of the cooling system.

Performance characteristics of the used component

The offered hose comes from the used original parts segment, which allows for combining reasonable cost with compliance with Audi's factory specifications. In practice, this means:

• preservation of the original geometry and stiffness of the hose,
• compatibility with factory clamps and connectors,
• possibility of use as a replacement for a worn, perished, or mechanically damaged component.

Replacing the breather hose is particularly recommended during cooling system maintenance when leaks, signs of overheating, or visible external damage occur.

Benefits of using the hose in a petrol engine

In petrol-powered vehicles, stable cooling is crucial for the durability of the power unit, especially in high-performance versions such as the RSQ3 and RS3. An efficient breather hose:

• supports even circulation of coolant throughout the system,
• helps reduce temperature fluctuations during dynamic driving,
• reduces the risk of localized overheating of engine components.

By maintaining the factory cooling system concept, the driver receives predictable engine operating conditions, which is important both in daily use and during intensive operation.

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 components from the same group, such as additional lines, flexible hoses, or rigid pipes, check the available parts in the Audi lines, hoses and pipes category.

When planning broader service work within engine accessories, it is also worth expanding your knowledge about component operation, so a practical guide for drivers may be helpful: When is it worth replacing an alternator with a used one: a practical guide for drivers.