Upgraded Auxiliary Water Pump

The Bosch Auxiliary Water Pump (part number 0392022010) is an OE-quality electric component manufactured in Germany. It serves as a critical part of a vehicle's cooling system, ensuring proper coolant circulation to the engine, heater core, and other coolant-dependent systems like turbochargers, particularly beneficial during low-speed driving or idling. This pump is identified as an upgraded version of the stock water pump used in some applications and is commonly found on contemporary AMG vehicles. It is a direct, 100% plug-and-play replacement for various Mercedes-Benz models, including the C32 AMG (2002-2004), SLK32 AMG (2002-2004), CL55 AMG (2003-2006), E55 AMG (2003-2006), S55 AMG (2003-2006), CL600 (2003-2014), S600 (2003-2005), and others listed in the fitment guide. Installation of this auxiliary water pump may involve working with coolant. For systems like the M275, there is a separate coolant circuit with Schrader valves for bleeding. For M278 engines, the intercooler circuit is shared with the engine cooling circuit, and draining can be performed from the main radiator. To purge old coolant, the pump can be cycled by applying 12 volts and ground directly to its 2-pin connector. The necessary connector for this pump is Mercedes part number 2305400081.