BMW E81 E82 E84 E87 E90 E91 E92 Coolant Expansion Tank Radiator Petrol 7543026

BMW E87 E90 E91 Petrol Expansion Tank is an original cooling system component from the Expansion Tanks category, designed for BMW cars with petrol engines. This used OEM part ensures proper functioning of the cooling system, fluid pressure stabilization, and safe discharge of excess coolant. It's a practical solution for drivers seeking a factory fit without the need to invest in a new part.

Specifications and technical data

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

Purpose and Function in the Cooling System

The presented expansion tank is a cooling system component for BMW 1 Series and 3 Series models with petrol engines. It is responsible for compensating for changes in coolant volume, maintaining a stable fluid level, and allowing for visual inspection. This enables the cooling system to operate within the designed pressure range, contributing to the longevity of the engine and its ancillaries.

As an OEM part, the tank has been specifically designed for the geometry of the BMW engine bay, ensuring secure mounting, correct hose routing, and compatibility with original sensors and cap.

Benefits of Using an Original BMW Expansion Tank

Using an original expansion tank in petrol-powered BMW E87, E90, and E91 vehicles allows for the cooling system's operating parameters to be maintained in line with the manufacturer's specifications. In practice, this means:

• factory fit to brackets and hoses in the engine bay,
• proper cooperation with the petrol engine's cooling system,
• maintenance of correct coolant circulation and bleeding,
• ability to check fluid level according to manufacturer markings.

For the user, this translates to a stable engine operating temperature and a reduced risk of overheating due to improper cooling system function.

Condition, Origin, and Installation Aspects

The offered expansion tank is a used part, sourced from a dismantled BMW vehicle. Such components are often chosen as an economical alternative to new parts, while retaining original design and fit. A used expansion tank helps reduce repair costs while maintaining compliance with factory specifications.

Installation is typical for this category of parts – after draining the cooling system and removing the old tank, the new component is installed in the original mounting points, connecting hoses and ancillaries according to the factory layout. This makes replacement predictable and does not require modifications to the system.

Application in BMW Petrol Vehicles

The product is intended for BMW cars with petrol engines, which is important for the cooling system's operating characteristics and compatibility with ancillaries. Selecting a tank that matches the fuel type helps maintain the system's appropriate thermal and hydraulic parameters, and also facilitates subsequent diagnostics and servicing.

For BMW car owners planning to replace the expansion tank due to leaks, micro-cracks, or material wear, this part offers a practical solution to restore the cooling system's proper function without affecting other components.

Related Products and Technical Knowledge

If you are looking for other BMW expansion tanks for various models of this brand, check out our dedicated category: BMW expansion tanks. You will find a wide selection of original cooling system components for many engine versions there.

When planning a comprehensive vehicle preparation for the season, it's worth paying attention not only to the cooling system but also to other wear parts. Practical tips can be found in the article Winter Essentials: Which Used Car Parts Are Worth Checking and Replacing Before the Frost?, which describes, among other things, the importance of checking cooling system components and selecting parts by OEM numbers.