BMW 1 3 Series E81 E87 E87N E90 E90N E91 E92 E93 Radiator Water Coolant 7788903

The BMW E81 E87 E87N E90 E90N E91 E92 E93 Water Radiator 7788903 is an original cooling system component designed for installation in the front of the vehicle body. Thanks to its factory fitment for specific generations of BMW 1 and 3 Series, it ensures stable engine operating conditions and predictable performance in urban traffic and highway driving. This is a practical solution for users looking for a proven BMW water radiator at a reasonable price.

Specifications and technical data

• SKU: 7788903
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7788903
• Substitutable numbers: 17117788903, 7788903, 7788898, 6334414, 4107215
• Location on the vehicle: Front
• Category: Caps

Purpose and Fitment for BMW Models

The presented water radiator is dedicated to popular BMW 1 Series E81, E87, E87N and 3 Series E90, E90N, E91, E92, E93 models. This means the design has been developed with the engine bay geometry of these generations in mind, which translates to proper mounting, correct hose routing, and compatibility with factory ancillary components.

Its placement in the front end of the vehicle allows for efficient use of airflow during driving, which is crucial for maintaining stable coolant temperature. This enables the cooling system to operate within the parameters set by the manufacturer, and the engine maintains proper operating characteristics.

Construction and Function of the Water Radiator

The water radiator in these BMW models serves as the central heat exchanger in the cooling system. Its construction, based on a dense network of channels and cooling fins, allows for effective heat dissipation to the surroundings, even under higher engine loads. The arrangement of the hose connections and mounting points is adapted to the factory hose layout, which facilitates installation and reduces the risk of leaks.

A properly selected radiator helps maintain a stable operating temperature, which affects:

• the durability of the engine and ancillary components,
• the efficiency of the lubrication system,
• fuel consumption under typical operating conditions,
• engine safety during prolonged load.

Condition, Origin, and Benefits of Choosing BMW Parts

The offered water radiator is an original BMW part from the Covers category, sourced from a dismantled vehicle. This used OEM component retains its factory geometry, ensuring it fits the designated mounting points and works with original fans, housings, and covers. This is a particularly beneficial solution for users who want to avoid fitting issues with aftermarket replacements of uncertain specifications.

Choosing an original BMW water radiator helps maintain the consistency of the cooling system with other components, which is especially important for cars driven dynamically or with all-wheel drive, where thermal loads can be higher.

Why Choose This BMW Water Radiator?

Using a dedicated water radiator in BMW E81–E93 is primarily a matter of operational safety and predictability. A correctly selected cooling system component:

• maintains stable engine temperature across a wide range of loads,
• reduces the risk of overheating in traffic jams and during high-speed driving,
• supports the proper operation of control electronics and assistance systems,
• simplifies servicing – the mechanic deals with a design familiar from factory assembly.

For many users, it is also important that a used OEM part allows for a reasonable balance between repair costs and maintaining near-factory parameters.

Related BMW Covers and Technical Knowledge

If you are looking for other BMW covers that fit your model, check out our dedicated category: BMW covers. There you will find a wide selection of body and equipment elements that will help maintain a consistent finish standard for your car.

When planning maintenance for a four-wheel-drive car with an advanced cooling system, it is worth understanding the specifics of individual manufacturer solutions. A practical discussion of the differences between AWD systems and their impact on operation can be found in the article xDrive, 4Matic, quattro, or 4Motion – a comparison of AWD drives from BMW, Mercedes, Audi, and VW, which helps you make informed decisions when selecting used components.