Nissens 831051 Engine Auxiliary Water Pump

Nissens 831051 Auxiliary Water Pump

The Nissens 831051 engine auxiliary water pump is built for vehicles that rely on an electric coolant circulation pump to manage thermal control beyond the main mechanical water pump. It features a 12-volt electrical design, a rectangular connector shape, and a plastic/steel housing for a direct-fit replacement approach on supported applications.

Compatible With select Audi and Volkswagen models, including Audi TT, Audi TT Quattro, Audi A6 Quattro, Audi Allroad Quattro, Audi S4, Volkswagen Golf, and Volkswagen Jetta. This part number, 831051, is a practical match for drivers replacing a failed auxiliary coolant pump in the listed applications.

Key Features

• Engine auxiliary water pump for coolant circulation support
• 12-volt electrical specification
• Rectangular connector shape
• Plastic / steel housing construction
• No pulley included
• No gasket or seal included
• No mounting bracket included
• No bolts included

Product Details

Nissens develops thermal and engine-efficiency components for the aftermarket with a focus on consistent manufacturing standards. The 831051 auxiliary water pump is intended for vehicles that use an electric coolant pump to help maintain proper coolant flow in specific operating conditions. For fitment-based searches, this Nissens 831051 part is listed for 2000-2002 Audi A6 Quattro, 2001-2002 Audi Allroad Quattro, 2000-2002 Audi S4, 2002-2006 Audi TT, 2001-2006 Audi TT Quattro, 2002-2006 Volkswagen Golf, and 2002-2005 Volkswagen Jetta.

This part cross-references Bosch 0392020039 for the same application.

Common Replacement Reasons

• Auxiliary coolant pump failure
• Intermittent or no electric coolant circulation
• Cooling system warning lights related to pump performance
• Heat management issues after shutdown or during low-speed operation
• Leakage or electrical connector-related pump faults

Installation Notes

Verify connector style, voltage, and mounting location before installation. This pump does not include a pulley, gasket or seal, mounting bracket, or bolts, so reuse or source the required related components separately as needed for the application. Confirm the vehicle’s cooling system is properly bled after installation and inspect the surrounding hoses, connectors, and coolant condition before returning the vehicle to service.

Quality Assurance

Nissens positions this part within its Genuine Nissens Quality standard, with products developed and manufactured to consistent thermal-management specifications for aftermarket use.