Audi A4 A5 8T Auxiliary Water Pump 2.0 TDI TFSI Diesel Petrol 8K0819147

The Audi A4 B8 auxiliary water pump is a cooling system component specifically designed for models in this series, ensuring stable coolant circulation under demanding engine operating conditions. As part of the Water Pumps group, it supports the main pump, improving cooling efficiency and reducing the risk of component overheating. A used OEM part is a sensible choice for drivers seeking a technically matched solution at an attractive price.

Specifications and technical data

• SKU: 8K0819147
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0819147
• Substitutable numbers: 8K0819147, 8K0 819 147
• Fuel type: Diesel
• Category: Water Pumps

Function and Role of the Auxiliary Water Pump in the Audi A4 B8

The auxiliary water pump in an Audi is responsible for stabilizing coolant flow in the circuit, especially during situations of increased thermal load. It supports the main pump by maintaining adequate fluid circulation in critical areas such as the engine block or auxiliary components, which translates to more uniform heat dissipation.

This design solution is particularly important in modern powertrains, where precise temperature control affects component durability, operational smoothness, and performance stability. A functional auxiliary water pump reduces the risk of localized overheating and supports the system's operation in urban conditions and during extended periods of idling with the engine running.

Benefits of Using an Original Auxiliary Pump

Choosing an original pump from the Audi group means maintaining factory flow and pressure parameters within the cooling system. A component designed for a specific vehicle platform ensures:

• precise fitment to factory mounting points and cooling system hoses,
• consistency with the engine's and auxiliary components' factory operating characteristics,
• adherence to the manufacturer's intended coolant circuit control logic.

This allows for an organized installation process without the need for modifications to the system or the use of adapters. This solution is particularly beneficial for workshops committed to technically correct repairs and for users who wish to maintain their vehicle in a configuration close to the factory standard.

Condition, Origin, and Service Application

The offered auxiliary water pump is a used part, sourced from disassembly, which allows for cost savings while retaining the original manufacturer's design. This type of part is ideal for:

• cooling system repairs following a main pump failure or overheating,
• preventive replacement of circuit components during major servicing,
• restoring the factory configuration in vehicles after modifications or incorrect repairs.

Selecting a component based on the manufacturer's part numbers ensures compatibility with the specific engine version and model year of the Audi A4 B8, which is crucial for the proper functioning of the entire cooling system.

Installation and Operational Recommendations

When replacing the auxiliary water pump, it is recommended to simultaneously inspect the condition of hoses, clamps, and the quality of the coolant. Proper installation, system bleeding, and the use of fluid with appropriate parameters will allow for the full utilization of the part's potential and reduce the risk of repeat service interventions. This is particularly important for vehicles subjected to intensive use or operated in varied temperature conditions.

For users who wish to deepen their knowledge on selecting components by manufacturer part numbers and the principles of diagnosing fuel and auxiliary systems, the blog article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair may be helpful, as it discusses a practical approach to identifying parts by factory numbers.

Expanding Audi Cooling System Service

If you are planning a comprehensive engine area repair or upgrade for your Audi and require other components from the same group, such as additional pumps, coolant circuit elements, or cooling support components, check the available parts in the Audi Water Pumps category.

For a service strategy focused on cost reduction and the use of disassembled parts, it is also worth considering the approach described in the material Eco-Tuning in Practice: How to Increase Performance While Reducing Carbon Footprint with Recycled Parts, which presents the advantages of conscious selection of used components in the context of economy and the environment.