Audi A3 8V 2.0 TDI Diesel Water Pipe Engine Cooling Coolant Hose Line 04L122073B

Audi A3 8V 2.0 TDI Diesel Water Pipe Engine Cooling Coolant Hose Line is an original cooling system component designed for diesel units, engineered by the Audi brand to ensure stable engine operation under various load conditions. The precisely shaped hose ensures proper coolant flow, supporting the maintenance of optimal operating temperatures and reducing the risk of overheating.

Specifications and technical data

• SKU: 04L122073B
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L122073B
• Substitutable numbers: 04L122073B, 04L 122 073 B, 04L122073E
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and function in the cooling system

The presented hose belongs to the Cooling system hoses and pipes group and is responsible for transporting coolant between system components in a diesel engine. The correctly selected shape and internal diameter allow for maintaining the appropriate pressure and circulation efficiency, which translates into stable operation of the 2.0 TDI power unit.

This element is particularly important in vehicles operated in city traffic and on long routes, where frequent changes in engine load generate large temperature fluctuations. A functional coolant water hose helps to:

• reduce the risk of localized overheating within the block and cylinder head,
• maintain an even flow of coolant,
• preserve the stability of diesel engine operating parameters during long-term driving.

Technical characteristics and fitment

As an original Audi component, the hose has been designed for proper routing in the engine bay, taking into account factory mounting points and installation paths. Thanks to this:

• it fits the factory cooling system without the need for modifications,
• it maintains the correct bending radius, minimizing the risk of kinks and flow restriction,
• it works in harmony with other system components, such as the radiator, connectors, and fittings.

The product is intended for Diesel fuel type engines, which means its construction takes into account the temperature ranges and thermal loads characteristic of diesel units.

Condition, origin, and advantages of using a used part

The offered hose comes from dismantling and is marked as Used, which in practice means it is a pre-owned part kept in functional working condition. Choosing this solution allows for optimizing service costs while maintaining compliance with Audi's factory specifications.

Key benefits of using an original coolant water hose from dismantling include:

• factory fitment for the Audi A3 8V cooling system with a 2.0 TDI engine,
• preservation of the original geometry and rigidity of the hose,
• possibility of quick replacement of a damaged element without the need for installation modifications.

The importance of a functional water hose for engine durability

In diesel engines, such as the 2.0 TDI, a stable operating temperature has a direct impact on the longevity of the power unit, turbocharger, and accessories. A leaking or deformed coolant water hose can lead to fluid loss, reduced cooling efficiency, and consequently, overheating.

To better understand how the entire cooling system affects the durability of the power unit and what symptoms may indicate problems with fluid circulation, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of diagnostics and service that help in choosing the right repair strategy.

Expanding the Audi cooling system – related 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 pipes, flexible hoses, or sections connecting to the radiator, check the available parts in the Audi cooling system hoses and pipes category.

A well-selected set of coolant water hoses allows you to refresh the entire fluid circuit during a single service operation, reduce the risk of future leaks, and ensure material consistency for components operating at high temperatures. As a result, replacing a single hose can become part of a broader, well-thought-out upgrade of the cooling system in your Audi A3 8V 2.0 TDI.