Audi A6 C6 Coolant Water Heater Pipe Hose Line 4F2819371AC 4F0819373AF

Audi A6 C6 Coolant Water Heater Pipe Hose Line is a component from the Cooling system hoses and pipes group, designed to manage fluid circulation in the cabin heating system. It is responsible for the stable, controlled routing of coolant between the heater core and other components, which directly impacts heating efficiency and uniform heat dissipation from the engine. Using an original Audi component is a sensible choice for cooling system maintenance when you prioritize proper fitment and predictable component behavior.

Specifications and technical data

• SKU: 4F0819373AF
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F0819373AF
• Substitutable numbers: 4F0819373AF, 4F0 819 373 AF
• Category: Coolant Hoses

Function and role of the heater hose

The heater hose in the Audi A6 C6 operates within the coolant circuit, connecting the heater core to the rest of the system. Its leak-tightness and correct shape are essential for:

• stable coolant flow through the heater core,
• maintaining the proper engine operating temperature,
• efficient vehicle interior heating without performance drops,
• reducing the risk of leaks in the critical bulkhead and engine bay area.

A well-selected hose minimizes stress on the connectors, reduces the possibility of chafing, and facilitates the servicing of other cooling system components.

Why choose an original Audi component

The original Audi heater hose was designed specifically for the geometry of the A6 C6 engine bay, ensuring:

• precise fitment to factory mounts and connectors,
• maintenance of the correct bending radius without flow restrictions,
• compatibility with factory clamps and brackets,
• material consistency with other cooling system components.

Choosing an original cooling system hose reduces the risk of installation issues, leaks, or interference with other components in the engine bay.

Characteristics of the used hose

The offered hose comes from dismantling and is a used component, which allows for lower repair costs while maintaining the manufacturer's original specifications. This type of part is a good solution when:

• the existing hose shows signs of cracks, splits, or material softening,
• leaks have appeared in the cooling system near the heater core,
• it is necessary to replace several hoses simultaneously during one service,
• you want to maintain the factory configuration of the system without using aftermarket alternatives with different geometry.

Selecting a used hose with parameters consistent with the factory design helps maintain predictable cooling and heating system behavior while controlling service costs.

Audi cooling system hoses and pipes – expansion and 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 flexible coolant hoses, return hoses, or sections connecting the heater core to the engine block, check out the available parts in the Audi cooling system hoses and pipes category.

More about cooling system operation

When replacing the heater hose, it is worth paying attention to the overall condition of the cooling system – the radiator, fans, other hoses, and the quality of the coolant. Our guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings explains how high temperatures and intensive use affect these components and where to look for savings while maintaining safety.