Bosch 039202320K Engine Auxiliary Water Pump

Engine Auxiliary Water Pump Overview

Bosch Engine Auxiliary Water Pump part number 039202320K is a 100% new replacement built to original equipment specifications. It is tested for function, sealing, and impeller-to-shaft integrity to support reliable cooling system operation.

This Bosch auxiliary water pump is a fitment-based replacement for Mercedes-Benz applications and is engineered around OE mating components for accurate alignment. The clockwise rotation design and single inlet/single outlet layout support proper system integration.

Key Features

• 100% new construction for direct replacement use.
• Torque-tested to verify impeller and shaft mating.
• Vacuum leak tested to confirm sealing performance.
• OE mating parts used to verify fitment accuracy.
• Clockwise rotation with one inlet and one outlet port.
• Brand line: Bosch Engine Auxiliary Water Pump.

Detailed Description

Part number 039202320K is an auxiliary water pump from Bosch designed to meet exact original equipment specifications. Bosch tests each pump for proper operation and checks for leaks across the housing, seals, tube binding, and plug areas. Fitment verification also includes mating components such as the pulley, brake plate, housing, and tensioners to help confirm correct installation geometry. This part cross-references Mercedes-Benz 0005000686 for the same application.

Compatible With Mercedes-Benz GLA250 and Mercedes-Benz CLA250 applications, this Bosch water pump supports the cooling circuit used by the engine auxiliary system. The mixed-material construction, 13 W rating, and clockwise rotation make it a precise replacement choice for vehicles requiring this configuration. Bosch 039202320K is a practical option when replacing a worn or leaking auxiliary pump on a Mercedes-Benz GLA250 or Mercedes-Benz CLA250.

Common Replacement Reasons

• Auxiliary coolant circulation loss.
• Leakage from pump housing or seals.
• Noise or irregular pump operation.
• Incorrect impeller or shaft engagement.
• Cooling system performance concerns tied to the auxiliary circuit.

Installation Notes and Tips

Verify clockwise rotation, inlet and outlet port layout, and OE mating component alignment before installation. This pump does not include mounting hardware or a gasket or seal, so confirm the required service parts for your application. Follow the vehicle service procedure for the Mercedes-Benz GLA250 or CLA250 auxiliary cooling system and inspect related components for wear before final assembly.

Quality Assurance

Bosch tests these pumps for functionality, torque integrity, and vacuum sealing before release. The part is built to OE specifications and validated with matching components to support proper fitment and sealing performance.