BMW E82 E90 LCI 135i 335i N55 Radiator Expansion Coolant Tank Bottle 7590626

The BMW E82 / E90 LCI 135i 335i N55 Coolant Expansion Tank is an original cooling system component designed for BMW models with the N55 engine. As part of the Expansion Tanks category, it ensures stable cooling system operation, proper coolant volume compensation, and safe pressure relief. This solution is dedicated to users seeking factory fitment and proven design for their BMW.

Specifications and technical data

• SKU: 7640515
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7640515
• Substitutable numbers: 17137640515, 7640515, 17137590626, 7590626, BG
• Category: Expansion & Overflow Tanks

Purpose and BMW Fitment

The presented expansion tank has been specifically designed for the cooling system in BMW 1 Series E82 and 3 Series E90 LCI models, specifically the 135i and 335i versions with the N55 engine. This means it retains the factory mounting geometry, has appropriately placed connection ports, and is compatible with original hoses and accessories. Consequently, installation is predictable, without the need for modifications or additional adapters.

Construction and Function in the Cooling System

As a component within the Expansion Tanks group, this tank plays a crucial role in stabilizing the pressure and volume of coolant during the N55 engine's operation. Its design includes:

• a coolant reservoir that works with the system's main circuit,
• a compensation space for coolant volume changes during engine heating and cooling,
• connections that enable proper circulation and bleeding of the cooling system.

The appropriately designed shape of the tank helps maintain a stable fluid level, which translates to uniform engine cooling and reduced risk of overheating under road and highway conditions.

Benefits of Using an Original BMW Tank

Using an original expansion tank in the BMW E82 / E90 LCI with the N55 engine allows for cooling system operating parameters to be maintained in line with the manufacturer's specifications. The main advantages include:

• factory fitment for mounts and accessories in the engine bay,
• consistency with the original BMW cooling system architecture,
• predictable behavior during temperature and pressure changes,
• the ability to use existing hoses and associated components.

For users who prioritize technical correctness in repairs and maintaining proper engine operating conditions, this tank is a practical choice when replacing a worn or leaking component.

Condition, Origin, and Service Application

The offered BMW expansion tank is a used part and is an original BMW brand component. It is suitable for both standard replacement of a worn tank and for comprehensive cooling system service work, such as replacing the radiator, hoses, or coolant. It allows for the restoration of correct system operation in cars used daily, as well as in vehicles operated under more demanding conditions.

Technical Support and Additional Information

When installing used cooling system components, it is important to pay attention to proper system bleeding, correct fluid selection, and regular level checks. If you want to better care for the operation of used parts and learn practical maintenance tips, check out the article How to Extend the Lifespan of Used Car Parts?

If you are planning comprehensive cooling system service for your BMW and are also interested in other components related to the coolant circuit, such as additional tanks, mounting elements, or similar components, check out the available parts in the BMW Expansion Tanks category.