BMW 1 3 Series E87 E90 E91 E92 Coolant Expansion Tank Bottle Petrol 7640514

BMW 1 3 Series E87 E90 E91 E92 Coolant Expansion Tank Bottle is an original cooling system component designed for BMW vehicles with petrol engines. It ensures stable system operation by monitoring coolant levels and compensating for pressure changes, which translates into safe engine performance. This is a practical solution for users looking for factory fitment without the need for any installation modifications.

Specifications and technical data

• SKU: 7640514
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7640514
• Substitutable numbers: 17137640514, 7640514, 17137607482, 7607482, 17137543026, 7543026, 17137567462, 7567462, 17137519368, 7519368, EM
• Fuel type: Petrol
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a component of the cooling system in BMW 1 and 3 Series E87, E90, E91, and E92 models with petrol engines. Its task is to take in excess coolant as the temperature rises and return it to the circuit once the pressure drops. Thanks to this, the cooling system maintains stable operating conditions, which reduces the risk of engine overheating and hose leaks.

A properly selected expansion tank allows for maintaining correct fluid circulation, facilitates system bleeding, and enables visual inspection of the working medium level. When replacing a worn or damaged component, using a part from the same BMW model family minimizes the risk of installation issues.

Compatibility and fitment for BMW

The BMW 1 3 Series E87 E90 E91 E92 Coolant Expansion Tank Bottle has been designed as a component compliant with the manufacturer's factory specifications. This means maintaining the correct geometry of the connectors, mounting points, and operating volume, which is crucial for proper cooperation with hoses, sensors, and the pressure cap in a given model.

The element has a dedicated OEM part number and associated interchangeable numbers, which facilitates verification of compatibility with a specific engine version and vehicle year. Before purchasing, it is worth comparing the markings with service documentation or the existing component to ensure full compatibility with the cooling system in your specific BMW.

Characteristics of the used component

The offered expansion tank is a used part, which in practice means it comes from vehicle dismantling and may show signs of normal wear, such as plastic discoloration or minor scratches. Such components are often chosen as an economical alternative to new parts, while maintaining the original design and fitment.

In the case of expansion tanks, the tightness of the body and the condition of the connection ports are particularly important. A used component allows for restoring the efficiency of the cooling system in a situation where the previous tank has cracked, deformed, or lost the transparency necessary for checking the fluid level.

Benefits of using an original expansion tank

• Factory fitment for the cooling system in BMW E87, E90, E91, E92 models.
• Maintenance of proper circulation and coolant volume compensation.
• Possibility of visual fluid level inspection during operation.
• Economical solution thanks to the use of a used part with an original design.
• Reduced risk of installation problems compared to aftermarket replacements with uncertain fitment.

Application in petrol vehicles

The presented expansion tank is intended for BMW cars with petrol engines. Cooling systems in such units have specific operating pressure and temperature parameters, which is why selecting a component compatible with the fuel type is important for the durability of the entire system. Using the correct tank helps maintain stable engine operating conditions, especially during intensive city or highway driving.

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other elements from the same group, such as additional tanks, mounting elements, or related components, check the available parts in the BMW Expansion Tanks category.

For drivers interested in a broader approach to drivetrain service and component optimization, it is worth checking out the guide on diagnostics and selection of drivetrain components, available in the article Clutch and dual-mass flywheel – diagnostics and selection of parts for the drivetrain, which helps in better planning of service work on your car.