Audi A4 B8 A5 8T Water Coolant Flange Pipe Hose Line 2.0 TDI 04L121131A

The Audi A4 B8 A5 8T 2.0 TDI Diesel Coolant Hose Pipe Water Flange is a cooling system component designed for 2.0 TDI diesel engines in Audi A4 B8 and A5 8T models. It is responsible for reliably directing coolant between engine components, which is crucial for maintaining a stable operating temperature of the powertrain.

Specifications and technical data

• SKU: 04L121131A
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L121131A
• Substitutable numbers: 04L121131A, 04L 121 131 A
• Part type: Pipe
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The presented Audi cooling system hose operates within the coolant circuit, connecting engine components with other system parts. A correctly selected water flange ensures:

• stable coolant flow within the 2.0 TDI engine area,
• maintenance of the engine's proper operating temperature,
• reduced risk of overheating and localized thermal stress.

Thanks to its precise fit for the Audi A4 B8 and A5 8T configuration, the hose integrates with the factory cooling system without requiring any modifications.

Construction and Fit for Audi A4 B8 / A5 8T 2.0 TDI

The water flange for the 2.0 TDI engine has been designed considering the engine bay geometry of the B8/8T platform. Its appropriate shape and connection diameters allow for:

• precise alignment with other cooling system hoses,
• secure sealing of connections when using appropriate clamps and seals,
• maintaining the original hose routing without interference with other engine accessories.

This precise fit minimizes stress on the hose during engine operation, contributing to longer, predictable service life.

Benefits of Using an Original Cooling Hose

Choosing an original hose from the Audi Cooling System Hoses and Pipes category offers a range of practical benefits:

• maintaining the factory cooling parameters for the 2.0 TDI engine,
• compatibility with stock cooling system and accessory components,
• no need to adapt aftermarket parts with uncertain geometry,
• easier diagnostics and servicing in the future due to compliance with manufacturer documentation.

This solution is particularly beneficial for precise diesel engines, where stable cooling impacts the smoothness of operation and component durability.

Item Condition and Service Application

The offered hose is part of the used cooling system components category. This type of component is often chosen as an economical yet technically sound solution for:

• repairs after coolant leaks around water flanges,
• preventive maintenance after engine overheating,
• restoring the factory configuration after previous modifications.

Before installation, a standard check of connection tightness and the condition of cooperating seals and clamps is recommended.

Technical Support and Additional Resources

If you are looking for other Audi Cooling System Hoses and Pipes, check out our dedicated offer: Audi cooling system hoses and pipes. This will help you easily select other coolant circuit components for your model.

Learn more about the impact of a functional cooling system on engine durability in the article: Engine Cooling System – Overheating, Repair, and Used Radiators, which discusses the practical consequences of engine overheating.

If you are considering the choice between a used part and an aftermarket replacement, the guide: 5 Reasons Why a Used OEM Part is a Better Choice Than an Aftermarket Replacement, which outlines specific criteria for selecting consumable parts, may also be helpful.