BMW 3 Series E90 323i 325i 328i 330i 05-11 4 PIN Electric Water Pump

BMW E90 Electric Water Pump — 4-Pin Cooling System Replacement

This 12V electric water pump is designed for selected BMW 3 Series E90 petrol models including 323i, 325i, 325xi, 328i and 330i applications using the N52, N52B30, N53 and N53B30 engine families. It replaces BMW OE number 11517586925 and related superseded references.

Unlike older belt-driven water pumps, many BMW E90 straight-six petrol engines use an electric coolant pump controlled by the engine management system. This allows the cooling system to regulate coolant flow according to engine temperature, load and driving conditions. When the electric pump fails, overheating can happen quickly and may lead to serious engine damage if ignored.

Always confirm fitment by VIN, engine code, OE number and connector type before ordering. BMW used different cooling-system layouts across model years, markets and engine variants.

Why this BMW electric water pump matters

• Restores correct coolant circulation through the BMW cooling system
• Helps protect the cylinder head, head gasket, radiator and heater circuit
• Supports stable operating temperature in traffic, long-distance driving and hot South African conditions
• Replaces common BMW OE references including 11517586925 and related superseded numbers
• Designed for selected N52 and N53 petrol engine applications using a 4-pin electric pump

BMW electric water pump overview

Common symptoms of a failing BMW E90 electric water pump

• Engine temperature warning on the dashboard
• Sudden overheating, especially in traffic or after a short drive
• Electric radiator fan running loudly or more often than normal
• Coolant circulation faults or cooling-system fault codes
• Heater performance changing as coolant flow becomes unstable
• Limp mode or reduced power when the engine gets too hot
• Coolant leaks around the pump area, hoses or thermostat connection

Why many BMW owners replace the thermostat at the same time

On many BMW electric cooling-system repairs, the water pump and thermostat are inspected together because both parts help control engine temperature. If the pump is replaced but the thermostat is weak, sticking or not responding correctly, the cooling system may still behave badly after the repair.

Pairing the correct thermostat with the water pump can reduce repeat labour and gives the cooling system a better chance of returning to stable operating temperature after repair.

BMW E90 N52 / N53 fitment guide

The table below focuses on BMW 3 Series E90 applications linked to the N52 and N53 petrol engine families. This water pump is listed with engine codes N52, N52B30, N53 and N53B30, and OE reference family 11517586925. Use this table as a guide only. Final confirmation must be done by VIN, OE number, engine code and connector type.

Broader BMW N52 / N53 engine family applications

The N52 and N53 engine families were used across several BMW models, including 1 Series, 3 Series, 5 Series, X3, X5 and Z4 applications. This wider list helps customers understand the BMW engine family, but it must not replace VIN-based water pump confirmation.

OE numbers and cross references

This pump is commonly matched using the following BMW OE references. Compare your old pump number where possible and confirm with VIN before ordering.

Before you order, confirm these details

Installation and bleeding best practice

• Drain and refill with the correct BMW-approved coolant mixture
• Use deionised or distilled water when mixing coolant
• Inspect the thermostat, hoses and expansion tank before reassembly
• Check the water pump electrical connector and wiring harness
• Do not reuse damaged seals, O-rings or incorrect fasteners
• Follow the correct BMW electric cooling-system bleeding procedure
• Clear fault codes and road test while monitoring temperature behaviour

Incorrect bleeding can cause trapped air, repeat overheating and false diagnosis of new-part failure.

What’s included

• BMW 4-pin electric water pump matched to the listed application
• Fitted vibration dampers where applicable
• Seals, bolts or accessories only where supplied by the manufacturer

Images are for illustration. Confirm by VIN, OE number, engine code and connector type before ordering.

FAQs

Warranty and important notes

• 12-month warranty against manufacturing defects
• Warranty does not cover incorrect fitment, poor installation, contaminated coolant or failure to bleed the system correctly
• Using incorrect coolant or plain tap water may cause corrosion and repeat cooling-system failure
• Professional installation is recommended for BMW electric cooling-system repairs