Audi A4 A5 8K B8 3.0 TDi Heater Matrix Connecting Coolant Pipes Hoses 8K2819371E

Cooling system pipes and hoses for Audi A4 and A5 B8 generation models, leading to the heater matrix, are a key component ensuring stable coolant circulation between the engine and the vehicle interior. The offered set connects the heater matrix to the cooling system, enabling efficient cabin heating and proper operation of the thermal system. This solution is intended for users looking for original geometry and fitment while maintaining a favorable price and factory compatibility with the B8 platform.

Specifications and technical data

• SKU: RHD-8K2819371E
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K2819371E
• Substitutable numbers: 8K2819371E, 8K2 819 371 E, 8K0819345F, 8K0 819 345 F
• Part type: Pipe
• Category: Coolant Hoses

Application and function in the cooling system

The set of pipes connecting the heater matrix to the cooling system in the Audi A4/A5 B8 is responsible for precisely routing coolant to the heat exchanger inside the dashboard. Properly selected pipes:

• ensure stable coolant flow in the small circuit and during engine warm-up,
• reduce the risk of leaks in the bulkhead and heater matrix area,
• maintain proper operating parameters for the cabin heating system. By maintaining the factory shape and diameters, this component allows for the restoration of proper heating operation without interfering with the original installation layout.

Benefits of using original Audi pipes

Original Audi cooling system pipes are designed for a specific platform, which translates into:

• secure routing of the pipe path – no tension, twisting, or rubbing against adjacent components,
• adequate resistance to the temperature and operating pressure of the coolant,
• consistency with factory quick-connectors, clamps, and mounts in the engine bay and at the bulkhead. Choosing an original solution is particularly important in vehicles with a densely packed engine bay, where every millimeter of pipe routing matters for durability and operational safety.

Characteristics of the used component

The offered set of pipes comes from dismantling, which allows for factory fitment at a lower cost than new components. The used element:

• retains the original construction and connection layout,
• is suitable as a replacement in case of leaks, cracks, or deformation of existing pipes,
• is effective in service repairs where compliance with factory specifications is a priority. Before installation, a standard check of tightness and the condition of connection surfaces is recommended, as well as replacing the coolant according to the vehicle manufacturer's procedure.

Selection, compatibility, and installation aspects

The component is intended for Audi A4 and A5 family models of the B8 generation equipped with a 3.0 TDI diesel engine, where the cooling system works with the heater matrix located in the HVAC module. When selecting parts, it is worth paying attention to:

• compatibility with the body version and engine type,
• the layout of connections on the bulkhead side and in the engine bay,
• the type of connectors and mounting clamps used. Professional installation helps avoid stress on the heater matrix ports and minimizes the risk of micro-leaks in areas that are difficult to access after the dashboard is installed. 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 additional pipes, return hoses, or sections leading to the radiator, check the available parts in the Audi cooling system pipes and hoses category.

Technical support and service knowledge

When working on the vehicle's thermal system, it is also worth considering the condition of other components – the radiator, thermostat, water pump, and elements responsible for thermal comfort in the cabin. For users who are simultaneously diagnosing air conditioning and cooling problems, the article describing when it pays to reach for used OEM components may be helpful – more information can be found in the entry No cooling in the car: original used air conditioning compressor as a proven alternative to expensive new parts. For VAG group vehicle owners considering broader modifications or retrofitting, including work on thermal and comfort systems, an additional dose of practical knowledge on using parts from dismantling can be found in the guide Retrofitting in VAG and BMW group cars: How to cheaply upgrade your car using used parts from higher versions?.