Nissens 831378 Engine Auxiliary Water Pump

Engine Auxiliary Water Pump for Mercedes-Benz

Nissens 831378 is an engine auxiliary water pump built for Mercedes-Benz applications that use a 12-volt electrical system and a D-shape connector. It features a plastic and steel housing, a mounting bracket, and no pulley, gasket, seal, or bolts included.

Compatible With Mercedes-Benz SL450, SL550, SLC43 AMG, SL63 AMG, E400, E550, SL400, SLK55 AMG, C250, C350, C63 AMG, GLK250, GLK350, C300, and E350 applications across model years 2008-2020, including select vehicles with heated windshield washers.

Key Features

• Nissens part number 831378
• Engine auxiliary water pump for thermal management and engine efficiency systems
• 12V electrical specification
• D-shape connector for application-specific fitment
• Plastic / steel housing construction
• Mounting bracket included
• No pulley included
• No gasket or seal included
• No bolts included

Detailed Description

Nissens 831378 is engineered as an auxiliary coolant pump used in Mercedes-Benz thermal management systems to circulate coolant where additional flow is required. Nissens develops and manufactures thermal and engine efficiency components to consistent quality standards, and this unit reflects that approach with application-specific construction and OE-style fitment details. It is a direct-fit option for a wide range of Mercedes-Benz models, including E-Class, C-Class, SL-Class, GLK-Class, and AMG variants.

This part cross-references Mercedes-Benz OE numbers 2048350264 and A2048350264 for the same application.

What It Helps Address

• Weak or inconsistent auxiliary coolant circulation
• Overheating concerns tied to supplemental pump failure
• Heater or thermal management performance issues
• Electrical connector or housing damage on the original pump
• Fitment problems when replacing a Mercedes-Benz auxiliary water pump

Installation Notes and Tips

• Verify the connector shape is D-shape before installation.
• Confirm the vehicle uses a 12V auxiliary pump configuration.
• Check whether your application requires heated windshield washer equipment, as several listed Mercedes-Benz models note that configuration.
• Transfer or source any required gasket, seal, or bolts separately, since they are not included.
• Inspect the mounting area and coolant lines for wear before installing the replacement pump.

Quality Assurance

Nissens positions this pump within its thermal management product range and manufactures it to the brand’s Genuine Nissens Quality standard. The part is built for the specified Mercedes-Benz applications and OE cross-reference numbers listed above.