2016-2019 BMW 7 Series 4.4 Water Pump 0392023248

Also known as

Auxiliary Water Pump

Electric Water Pump

Heater Coolant Pump

Additional Water Pump

Turbo Coolant Pump

Secondary Coolant Pump

What this part does

The auxiliary water pump is an electrically driven coolant pump that supplements the primary mechanical water pump. In the BMW V8 cooling system, this unit maintains coolant circulation through the heater core when the engine is idling or operating at low RPMs, ensuring consistent climate control performance. It also circulates coolant through the turbocharger bearing housings after the engine shuts down, preventing oil coking and heat soak damage. When this electric water pump fails, cabin heat often drops significantly at idle, and the vehicle may store diagnostic trouble codes related to turbo cooling or secondary pump operation.

Fits these vehicles

OEM and interchange numbers

0392023248

0 392 023 248

64119339949

64119339948

Before you order

• Verify the part number 0392023248 against your original unit, as BMW uses several visually similar auxiliary pumps with different mounting brackets and electrical connectors depending on the exact cooling circuit.
• This component does not require software coding to the vehicle, but any stored faults in the climate control or engine control modules must be cleared to restore normal pump operation.
• After installation, the cooling system must be properly bled using the automated electronic bleeding procedure via the accelerator pedal to prevent airlocks in the heater core and turbocharger lines.
• Inspect your original wiring harness connector for signs of coolant ingress, which can occasionally wick up the harness if the original pump seal failed.