Audi A7 4G8 Engine Coolant Hose Tube Line Pipe 3.0 TFSI Quattro CGWB 4G0145923C

Audi A7 4G8 Engine Coolant Hose Tube Line Pipe 3.0 TFSI Quattro CGWB is an original component from the Cooling system hoses and pipes group, designed to operate in the demanding cooling system of the 3.0 TFSI Quattro engine. Engineered by the vehicle manufacturer, it ensures proper coolant routing, stable thermal engine operation, and predictable behavior of the entire system under real-world road conditions.

Specifications and technical data

• SKU: 4G0145923C
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0145923C
• Substitutable numbers: 4G0145923C, 4G0 145 923 C
• Part type: Hose
• Category: Coolant Hoses

Purpose and function in the cooling system

The coolant hose in the Audi A7 4G8 with the 3.0 TFSI Quattro engine is responsible for the controlled flow of coolant between key system components. The precise shape, diameter, and factory-tuned flexibility of the hose translate into:

• stable maintenance of the engine's operating temperature,
• proper cooperation with the water pump and heat exchangers,
• reduction of the risk of localized overheating and pressure drops in the circuit. Thanks to a design consistent with the manufacturer's specifications, the hose maintains proper geometry under load, does not kink, and does not cause unwanted flow restrictions.

Original construction and installation fitment

As an Audi brand component, the coolant hose is precisely matched to the engine bay layout of the A7 4G8 model with the 3.0 TFSI Quattro unit. This means:

• factory mounting points and routing along original brackets,
• compatibility with original cooling system connectors and fittings,
• no need for modifications, custom adapters, or shortening of the hose. Such fitment facilitates installation, reduces service time, and decreases the risk of leaks resulting from improper hose positioning. Original geometry is particularly important in a densely packed engine bay, where every millimeter of space matters.

Performance characteristics and benefits of use

In the cooling systems of modern turbocharged gasoline engines, such as the 3.0 TFSI, hoses operate at elevated temperatures and under variable pressure. Using an original coolant hose ensures:

• adequate resistance to coolant temperature and under-hood conditions,
• proper wall rigidity, limiting hose swelling under load,
• compatibility with the factory coolant used by Audi. This solution is recommended both for post-failure repairs and for preventive replacement of cooling system components when signs of wear, rubber cracking, or localized weeping at the connectors appear. Selecting a hose consistent with the manufacturer's design helps maintain engine thermal stability and reduces the risk of costly damage resulting from overheating.

Condition, verification, and service application

The item comes from dismantling and is intended for users and workshops looking for original components at a reasonable price. This type of hose is particularly useful in:

• routine cooling system repairs after leaks are detected,
• vehicle restoration after a collision involving damage to the front end and engine accessories,
• service projects where maintaining factory specifications is a priority. Before installation, a standard check of leak-tightness, the condition of the connection surfaces, and the overall material flexibility is recommended, in accordance with good service practice for used cooling system components.

Selection support and additional materials

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional lines, return hoses, or sections connecting to the radiator, check the available parts in the Audi cooling system hoses and pipes category. When working with thermal and air conditioning systems, it is worth expanding your knowledge on selecting used components. Practical tips on assessing the condition of parts, diagnostic principles, and the cost-effectiveness of using dismantled parts can be found in the article No cooling in the car: an original used A/C compressor as a proven alternative to expensive new ones. For those carrying out a broader car restoration in a garage setting, the guide Garage project: how to rebuild your "daily" cheaply using proven parts from dismantling, which discusses repair planning, selecting original components, and safety issues, may also be helpful.