Bosch 0392020026 Heater Water Pump

Bosch Engine Auxiliary Water Pump for Mercedes-Benz

Bosch Engine Auxiliary Water Pump part number 0392020026 is a direct-fit heater water pump for select Mercedes-Benz applications. It is built to original equipment specifications and tested for proper operation, sealing, and impeller-to-shaft integrity.

Compatible With Mercedes-Benz G550, G55 AMG, G500, SLK230, SLK32 AMG, SLK320, CLK320, E320, CLK430, E430, E55 AMG, C230, C280, C36 AMG, E300, and C220 applications across model years 1994-2015.

Key Features

• Bosch Engine Auxiliary Water Pump line for heater water pump service
• Part number 0392020026 for OE-style replacement selection
• Built to match original equipment specifications
• 100% tested for functionality before release
• Torque tested to verify impeller and shaft mating
• Vacuum leak tested to check housing, seals, tube binding, and plug sealing
• Uses OE mating parts and accessories to verify fitment where reusing the isolator grommet and bracket

Detailed Description

This Bosch heater water pump is designed for Mercedes-Benz cooling and auxiliary heater circuits where consistent coolant circulation is required. The Bosch Engine Auxiliary Water Pump line focuses on OE-level fit and function, and part number 0392020026 is engineered for applications including Mercedes-Benz G550, G55 AMG, G500, SLK230, SLK32 AMG, SLK320, CLK320, E320, CLK430, E430, E55 AMG, C230, C280, C36 AMG, E300, and C220. Bosch also verifies fitment with OE mating parts and accessories when the isolator grommet and bracket are reused.

This part cross-references 0018351364 for the same application.

What It Helps Address

• Weak or inconsistent heater coolant circulation
• Auxiliary pump noise caused by internal wear
• Leaks from the pump housing, seals, or plug area
• Fitment issues after replacing an original Mercedes-Benz auxiliary water pump
• Reduced heater performance in vehicles using an engine auxiliary water pump

Installation Notes and Tips

Confirm the vehicle’s chassis breakpoints and equipment notes before ordering, especially for SLK230, SLK32 AMG, SLK320, C230, C280, C36 AMG, E300, and E320 applications with chassis-specific or heated-washer-system notes. Reuse the isolator grommet and bracket only when they are in serviceable condition, since Bosch references OE mating parts for those reused components. Verify the connector, hose routing, and mounting points against the removed pump before installation.

Quality Assurance

Bosch states that this pump is new, tested for proper functionality, torque tested to confirm impeller-to-shaft mating, and vacuum leak tested for sealing integrity. These checks support reliable operation in Mercedes-Benz auxiliary cooling and heater water pump applications. Part number 0392020026 is also listed with interchange reference 0018351364.