Bosch 0986338401 Engine Auxiliary Water Pump

Bosch Engine Auxiliary Water Pump

Bosch Engine Auxiliary Water Pump part number 0986338401 is a new OE-spec replacement built for precise fitment and dependable cooling-system operation. It is designed for vehicles that use an auxiliary water pump to manage engine coolant flow, including Audi TT Quattro, Volkswagen Golf, GTI, and related applications.

Key Features

• New Bosch auxiliary water pump built to original equipment specifications
• Torque tested to verify proper impeller-to-shaft mating
• Vacuum leak tested to confirm sealing integrity across the housing and seals
• Uses OE mating parts and accessories during fitment verification
• Clockwise (right) rotation
• 1 inlet port and 1 outlet port
• Mixed-material construction
• Part number 0986338401

Product Details

This Bosch auxiliary water pump is engineered for direct replacement in cooling-system service where accurate coolant circulation is required. Bosch validates the pump with torque testing and vacuum leak testing, helping confirm internal assembly quality and sealing performance. Fitment verification also uses OE mating components such as pulley, brake plate, housing, and tensioners to check proper alignment and installation compatibility. This part number 0986338401 is listed for 2015-2023 Audi, Volkswagen, and Bentley applications, including Audi A3, A3 Quattro, and TT Quattro, as well as Volkswagen Golf, Golf Alltrack, Golf SportWagen, GTI, Golf R, and Passat. It also fits Bentley Bentayga and Flying Spur applications that use this engine auxiliary water pump design.

What It Helps Address

• Loss of auxiliary coolant circulation
• Cooling-system flow irregularities tied to pump wear
• Leaks related to pump housing or seal failure
• Noise or performance issues from an internally worn pump assembly
• Fitment problems when replacing an OE auxiliary water pump

Installation Notes

Confirm clockwise rotation before installation and verify the inlet and outlet port orientation against the original unit. This pump does not include a gasket or seal, mounting hardware, or a mounting bracket, so reuse or source the required installation components as needed. Because auxiliary pump layouts vary by engine and model year, match the vehicle application carefully before service. Fits 2016-2023 Audi TT Quattro, N/A. Fits 2017-2022 Bentley Bentayga, N/A. Fits 2020-2022 Bentley Flying Spur, N/A. Fits 2017-2019 Volkswagen Golf Alltrack, N/A. Fits 2015-2019 Volkswagen Golf SportWagen, N/A. Fits 2015-2018 Audi A3 Quattro, N/A. Fits 2015-2018 Volkswagen Golf, N/A. Fits 2018 Volkswagen Golf R, N/A. Fits 2015-2018 Volkswagen GTI, N/A. Fits 2015-2016 Audi A3, N/A. Fits 2015 Volkswagen Passat, N/A.

Quality Assurance

Bosch tests each water pump for proper function, including torque verification and vacuum leak testing, to help confirm assembly quality and sealing performance. The brand also checks OE mating parts during fitment validation to support correct installation on the listed Audi, Volkswagen, and Bentley applications.