Bosch PAD 12V Electric Auxiliary Coolant Pump

The Bosch PAD 12V Electric Auxiliary Coolant Pump (Model 0 392 023 004) is a highly compact, lightweight, and ultra-reliable centrifugal water pump. Driven by a brushless motor and a permanent-magnet coupling, this 12V pump is engineered in Germany to deliver continuous, demand-based coolant circulation. Because of its legendary durability and incredibly quiet operation, it is widely utilized as an OEM component in premium European vehicles and is a top choice for custom automotive plumbing.

Key Specifications:

• Category: Automotive Parts & Accessories / Engine Cooling / Electric Water Pumps

• Product Type: Electric Auxiliary Coolant Pump (PAD 12V)

• Manufacturer: Bosch

• Model / Part Number: 0 392 023 004 (0392023004)

• Operating Voltage: 12V DC

• Nominal Flow Rate: 900 Liters per hour (l/h) / 15 Liters per minute

• Nominal Pressure: 0.1 bar

• Motor Type: Brushless permanent-magnet electric motor

• Protection Rating: IP69K (Highly water and dust resistant)

• Origin: Made in Germany

Key Features:

• Magnetic Drive System – Features a glandless design where the motor's torque is transferred to the impeller via a magnetic coupling. This entirely eliminates the need for dynamic shaft seals, removing the most common point of leakage and failure.

• Compact & Lightweight – The PAD brushless design significantly reduces the overall length and weight compared to traditional brushed pumps, making it incredibly easy to package in tight engine bays or custom builds.

• Continuous Duty Rated – Built for "S1" continuous operating mode with an extended service life and high temperature resistance.

• Ultra-Quiet Operation – The brushless motor and sealed magnetic drive ensure exceptionally low noise and vibration levels, making it ideal for premium vehicle cabins and silent EV operations.

• Foolproof Installation – Features clearly molded positive (+) and negative (-) polarity indicators directly on the housing base next to the D-shaped 2-pin connector plug.

Ideal For:

• Auxiliary parking heater circuits (such as Webasto or Eberspächer setups)

• Residual engine heat utilization and cabin heating circuits in vans and RVs

• Turbocharger and charge-air cooler (water-to-air) thermal management

• Cooling loops for hybrid and electric vehicle (EV) power electronics and inverters

• Direct OEM replacement for various Mercedes-Benz, VW, and Audi auxiliary pumps

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