Expansion Tank BMW X5 E70 X6 E71 Water Radiator Coolant Reservoir 7552546

BMW X5 E70 X6 E71 Coolant Expansion Tank is an original cooling system component designed for BMW X5 E70 and X6 E71 models. It ensures stable system operation by controlling coolant level and compensating for thermal expansion. Thanks to its factory design, the expansion tank guarantees a proper fit in the engine bay and correct interaction with other components.

Specifications and technical data

• SKU: 7552546-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7552546
• Substitutable numbers: 7552546, 17137552546, 8621092, 17138621092, 7647290, 17137647290, 8630170, 17138630170
• Category: Expansion & Overflow Tanks

Purpose and Function in the Cooling System

The presented expansion tank is a cooling system component responsible for maintaining a coolant reserve and absorbing excess pressure generated during engine heating. A correctly selected tank allows for:

• stabilization of pressure in the cooling system under varying engine loads,
• safe discharge of excess coolant and its return after cooling,
• visual monitoring of the coolant level,
• maintenance of the entire circuit's seal.

Thanks to its design conforming to factory solutions, the cooling system of BMW X5 E70 and X6 E71 retains its designed operating parameters, which translates to the durability of the powertrain.

Original BMW Fitment

As a BMW group component, the expansion tank has been designed for specific mounting points, hose diameters, and pipe geometry within the engine bay. This means:

• secure fit with factory brackets and accessories,
• proper routing of coolant hoses,
• compatibility with original sensors and pressure cap,
• maintenance of the intended working capacity.

Such a fit minimizes the risk of leaks and eliminates the need for installation modifications, which is particularly important in modern BMW SUVs.

Condition of the Part and Benefits of Using a Used Part

The offered tank comes from the used original parts segment, allowing for a combination of reasonable cost with the preservation of the design intended by the vehicle manufacturer. In practice, this means:

• retention of the cooling system's factory geometry and operating parameters,
• no compatibility issues typical of aftermarket parts with universal designs,
• economical repair in case of damage to the existing tank.

For workshops and private users, this is a solution that allows for restoring the cooling system's functionality without altering its designed configuration.

Why Use a Dedicated Expansion Tank

In vehicles like the BMW X5 E70 and X6 E71, the cooling system operates under significant load, especially during highway driving or when towing. Using a dedicated expansion tank leads to:

• more predictable engine operating temperatures,
• reduced risk of overheating due to coolant loss,
• easier diagnosis of potential leaks,
• compliance with BMW's factory service procedures.

For users who value proper powertrain operation, this is an important element of preventative maintenance.

Related Products and Technical Knowledge

If you are upgrading or servicing the cooling system in your BMW and also need other components from the expansion tanks category dedicated to this brand, check the available parts in the BMW Expansion Tanks category.

If you are interested in how the use of original, used components affects the car's character and driving properties, it is worth reading the article Audi and Pure Emotion. How Used Parts Help Maintain Brand DNA?, which discusses this topic using another premium brand as an example.