Keep coolant moving through the heater and auxiliary cooling circuit with the Bosch Auxiliary Water Pump / Heater Water Pump 0392020026, a new electric water pump engineered to exact original equipment specifications. It fits many vehicles, among them the 2003-2011 Mercedes-Benz G55 AMG, 2009-2015 Mercedes-Benz G550 and 2002-2008 Mercedes-Benz G500. See the Buyer's Guide tab for the full list. The pump is listed under both names, auxiliary water pump and heater water pump.
- Tested before it ships: Every pump is 100% tested for proper function. Torque testing verifies correct impeller-to-shaft mating and can detect a loose press fit. Vacuum leak testing checks the housing, seals, tube binding and plugs for leaks.
- Fitment verified with OE mating parts: Bosch checks fitment using original equipment mating parts and accessories.
- Built for heat: Designed to withstand engine temperatures up to 125°C, with few moving parts.
- Quiet, efficient operation: Designed to run quietly and to optimize coolant flow, which is intended to improve overall system efficiency.
Specifications: 13 W electric pump with clockwise (right) rotation, one inlet port and one outlet port. The listed applications use one pump. Mounting hardware, a gasket or seal, and a mounting bracket are not included. Country of origin: Germany.
Signs that an auxiliary heater pump may need replacing include weak or no cabin heat, coolant leaks at the pump, and unusual pump noise. Other cooling-system faults can cause similar symptoms, so diagnose the cause before you replace the pump.
