BMW E46 E87 E90 E91 116i 118i 120i 318i 320i N45 N46 Coolant Water Pump 7500594

BMW E46 E87 E90 E91 116i 118i 120i 318i 320i N45 N46 Coolant Water Pump is an original component from the Water pumps group, designed for BMW N45 and N46 petrol engines in E81, E87, and E90 models. This used pump provides a functional service solution for drivers looking to restore the efficiency of the cooling system while maintaining the factory design concept.

Specifications and technical data

• SKU: 7500594-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7515778
• Substitutable numbers: 7515778, 11517515778, 7511220, 11517511220, 7511221, 11517511221, 11517500594, 7500594
• Fuel type: Petrol
• Category: Water Pumps

Purpose and function in the cooling system

The water pump in BMW N45/N46 petrol engines is responsible for the forced circulation of coolant between the engine block, cylinder head, and heat exchangers. A properly functioning pump stabilizes the engine's operating temperature, reduces the risk of overheating, and supports uniform heat dissipation throughout the entire circuit.

In the event of symptoms such as rising temperatures, uneven heating, a drop in cabin heating efficiency, or leaks in the pump drive area, replacing it with a functional unit from the same design group is one of the essential service actions.

Compatibility with BMW petrol engines

The presented pump is intended for petrol units, which is crucial for selecting parts for a specific fuel type. Using the correct pump for a petrol engine ensures:

• appropriate coolant flow characteristics,
• compatibility with engine accessories and the pump drive system,
• consistency with BMW's factory specifications.

As a result, the cooling system maintains parameters close to the original, which promotes stable engine operation and predictable vehicle behavior under various operating conditions.

Characteristics of the used water pump

The used BMW water pump is a service solution that allows for reduced repair costs while maintaining original geometry and mounting points. The part is sourced from dismantling, meaning the construction and installation method correspond to BMW factory standards, and installation does not require cooling system modifications or additional alterations.

In practice, this means:

• maintaining factory routing of hoses and drive belts,
• proper fitment to the engine housing and accessories,
• the ability to use standard assembly and service procedures.

Benefits of using an original BMW Water pump

Using an original pump from the Water pumps category instead of a worn-out component allows for the restoration of proper coolant circulation and reduces the risk of costly failures resulting from engine overheating. For the user, this means more stable engine operation, better temperature control, and greater predictability in daily use.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as pump housings, covers, or additional mounting elements, check the available parts in the BMW Water pumps category.

Selection by part numbers and technical support

The water pump has a dedicated OEM part number and associated interchangeable numbers, which facilitates precise identification and selection for a specific engine version and vehicle year. When matching, it is recommended to use the part number, data from the rating plate, and information from BMW catalogs to avoid assembly errors.

For users who want to deepen their knowledge about the diagnostics and selection of engine supply components, the article describing the principles of operation and servicing of the fuel system may be helpful, available here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

To better understand the impact of a functional water pump on protecting the engine unit from overheating, it is also worth reading the guide on the cooling system: Engine cooling system – overheating, repair, and used radiators.

Summary

BMW E46 E87 E90 E91 116i 118i 120i 318i 320i N45 N46 Coolant Water Pump is a used, original cooling system component designed for BMW petrol engines. Choosing this pump allows you to restore proper coolant circulation, preserve factory design solutions, and maintain a stable engine operating temperature, which translates into safer and more predictable vehicle operation.