Audi A6 C7 A7 4G Water Pipe Hose Engine Coolant Cooling Line 3.0 TDI 4G2819350AC

The Audi A6 C7 / A7 4G 3.0 TDI Coolant Hose is an original part from the Cooling System Hoses and Pipes group, designed for operation in the demanding engine bay environment. Engineered by Audi for stable coolant flow, it supports proper heat dissipation from the powertrain, which is crucial for engine durability and operational safety.

Specifications and technical data

• SKU: RHD-4G2819350AC
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G2819350AC
• Substitutable numbers: 4G2819350AC, 4G2 819 350 AC
• Fuel type: Petrol
• Part type: Hose
• Category: Coolant Hoses

Purpose and Function in the Cooling System

This coolant hose is a component of the cooling system responsible for directing coolant between selected engine and auxiliary components. In Audi A6 C7 and A7 4G models with the 3.0 TDI engine, it is responsible for:

• maintaining stable coolant flow in the designated circuit,
• limiting localized overheating in the powertrain area,
• cooperating with other hoses, the radiator, and the coolant pump within a single, cohesive system.

Thanks to its factory-designed geometry and fit for the specific engine configuration, the hose maintains proper connection sealing and correct routing relative to other components in the engine bay.

Original Audi Design and Fitment

As an Audi part, the hose has been designed for the specific architecture of the 3.0 TDI engine and cooling system. This means:

• precise matching of connection diameters to the spigots on the engine and auxiliaries,
• appropriately selected material stiffness and flexibility,
• maintaining the correct hose routing, minimizing the risk of abrasion and contact with hot or moving parts.

This solution facilitates installation and reduces the need for modifications, which is particularly important when servicing modern diesel engines.

Operational Parameters and Application

The coolant hose has been prepared for operation in the cooling system of an engine powered by petrol, maintaining appropriate resistance to temperature and contact with coolant. The hose's design accounts for:

• operation in variable thermal conditions,
• resistance to typical vibrations and loads found in the engine bay,
• compatibility with factory clamps and mountings.

This allows the hose to be used for both standard replacement of a worn part and for more extensive cooling system servicing, such as radiator or coolant pump replacement.

Condition, Verification, and Benefits of Installation

This part is from a dismantled vehicle and is offered as a used Audi cooling system hose. This type of part allows for economical vehicle repair while maintaining the original manufacturer's specifications. By choosing the coolant hose from this offer, you gain:

• factory fitment for the specific A6 C7 / A7 4G generation,
• retention of the original hose routing geometry,
• the ability to restore proper coolant circulation after a failure or leak.

This is a practical solution for users who want to maintain the integrity of the cooling system with the original Audi design, without the need for aftermarket parts with uncertain fitment.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other parts from the same group, such as additional pipes, hoses, or cooling system connectors, check the available parts in the Audi Cooling System Hoses and Pipes category.

Cooling System Operation and Service Knowledge

A properly functioning cooling system directly impacts engine lifespan, stable operating temperature, and driving safety. Replacing a coolant hose is often part of a broader service, including checks for leaks, the condition of the radiator, thermostat, and coolant pump. To better understand overheating symptoms, common faults, and best practices for selecting used cooling system components, it is worth consulting the guide: Engine Cooling System – Overheating, Repair, and Used Radiators.