Bosch 0392023044 Engine Auxiliary Water Pump

Bosch Engine Auxiliary Water Pump

The Bosch Engine Auxiliary Water Pump, part number 0392023044, is a direct-fit replacement built to original equipment specifications for Mercedes-Benz cooling system service. It is 100% new and tested for proper function, sealing, and impeller-to-shaft integrity.

Designed for Mercedes-Benz models that use an auxiliary coolant pump, this Bosch water pump supports consistent coolant circulation in the engine cooling circuit. It is a practical OE-style replacement for Mercedes-Benz E350, E550, C350, and SL550 applications, with fitment coverage across multiple model years.

Key Features

• Bosch Engine Auxiliary Water Pump, part number 0392023044
• Built to exact original equipment specifications
• 100% new construction
• Torque tested to verify impeller and shaft mating
• Vacuum leak tested for sealing integrity
• Uses OE mating parts and accessories for fitment verification
• Clockwise rotation
• 1 inlet port and 1 outlet port
• 13 W water pump design
• Mixed material construction

Detailed Description

Bosch’s Engine Auxiliary Water Pump line focuses on OE-level fitment and validation for cooling system service. This unit is tested for torque consistency to help confirm proper impeller-shaft engagement, and it is vacuum leak tested to check for sealing issues in the housing, seals, tube binding, and plug areas. Bosch also verifies component mating with OE-style accessories such as pulleys, brake plates, housings, and tensioners to confirm proper fitment. This part number 0392023044 is used on select Mercedes-Benz vehicles including E350, E550, C350, C63 AMG, GLK350, SL550, and SL63 AMG applications.

This part cross-references part number 2048350264 for the same application.

What It Helps Address

• Auxiliary coolant circulation problems
• Cooling system leaks at the pump housing or seals
• Impeller or shaft fitment concerns
• Poor coolant flow in Mercedes-Benz engine auxiliary cooling circuits
• Replacement needs for worn or failed OE-style auxiliary water pumps

Installation Notes and Tips

Confirm the vehicle’s engine auxiliary water pump configuration before ordering. This Bosch 0392023044 pump has clockwise rotation, one inlet port, and one outlet port, and it does not include a gasket or seal, mounting hardware, or a mounting bracket. Verify all mating surfaces are clean and inspect related cooling components before installation.

Quality Assurance

Each Bosch auxiliary water pump is tested for function, torque integrity, and vacuum sealing before release. The brand’s OE fitment verification process helps confirm proper component mating for the listed Mercedes-Benz applications.