Audi A4 B8 A5 8T Heater Coolant Hose Pipe Water Line 2.0 TDI 8K2819350AD

Audi A4 B8 A5 8T Heater Coolant Hose Pipe Water Line is an original component from the Cooling system hoses and pipes group, designed for 2.0 TDI diesel engines. Engineered by the vehicle manufacturer, it ensures proper coolant flow to the heater core, stable thermal system operation, and predictable engine performance during daily use.

Specifications and technical data

• SKU: RHD-8K2819350AD-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K2819350AD
• Substitutable numbers: 8K2819350AD, 8K2 819 350 AD, B 000 750 M1, B000750M1
• Part type: Pipe
• Category: Coolant Hoses

Purpose and function in the cooling system

The offered hose is a component of the system supplying coolant to the heater core in Audi A4 B8 generation and Audi A5 8T models with the 2.0 TDI unit. It is responsible for:

• stable coolant flow between the engine and the heater core,
• maintaining the proper operating temperature of the power unit,
• ensuring efficient operation of the vehicle's interior heating,
• reducing the risk of overheating in the heater core area. Thanks to its factory geometry and fitment for the specific engine-body configuration, the hose maintains proper connection tightness and correct routing in the engine bay, which facilitates service and reduces stress on the connectors.

Original origin and fitment

As an Audi brand component, the hose was designed for a specific platform and power unit, adhering to the manufacturer's requirements regarding fluid flow, temperature resistance, and compatibility with other cooling system components. This means:

• secure fitment to factory brackets and mounts,
• compatibility with original quick-connectors and clamps,
• no need for modifications or adjustments to the hose length. Such a solution is particularly beneficial when servicing vehicles used intensively, where ease of installation and maintaining cooling system performance according to the manufacturer's specifications are essential.

Performance characteristics of the used component

The hose comes from disassembly, which allows for maintaining the original material and design specifications while reducing repair costs. A used component of this type is a preferred choice in situations where:

• a quick replacement of a damaged hose is necessary after a failure or leak,
• maintaining the factory routing of hoses in the engine bay is important,
• an OEM-compliant solution is sought, but in a more economical variant. A properly selected cooling system hose helps maintain a uniform engine operating temperature, which translates into its durability and stability of combustion parameters.

The importance of the correct hose in the cooling system

A functional heater hose has a direct impact on the thermal safety of the power unit. Leaks, reduced cross-section, or incorrect hose routing can lead to local overheating, issues with system venting, and insufficient cabin heating. The correct component from the Cooling system hoses and pipes group minimizes these risks, ensuring:

• stable coolant flow,
• proper cooperation with the water pump and heater core,
• maintaining tightness over a long period of operation. To better understand how individual components affect the durability of the power unit and what symptoms may indicate cooling problems, it is worth checking the guide: Engine cooling system – overheating, repair, and used radiators.

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 hoses, return lines, or sections connecting to the radiator, check the available parts in the Audi cooling system hoses and pipes category.