BMW 1 3 Series F20 F21 F30 LCI Hose Radiator Transmission Oil Cooler 8633483

BMW 1 3 Series F20 F21 F30 LCI Hose Radiator Transmission Oil Cooler is an original transmission oil cooling hose designed for BMW 1 and 3 Series LCI (Life Cycle Impulse) models. This component belongs to the Cooling System Hoses and Pipes group and ensures a stable connection between the radiator and the transmission oil cooler, supporting safe heat dissipation from the drivetrain. Thanks to its factory geometry and connectors, the hose allows for precise installation without the need for modifications.

Specifications and technical data

• SKU: 8633483
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8633483
• Substitutable numbers: 17128633483, 8633483, PK
• Category: Coolant Hoses

Purpose and function in the cooling system

This hose is designed to operate in the circuit between the radiator and the automatic transmission oil cooler, where it is responsible for the stable flow of the cooling medium. A properly functioning hose reduces the risk of transmission overheating, which translates into the longevity of the gearbox and the consistent, predictable operation of the entire drivetrain.

Its original BMW origin ensures that factory diameters, shapes, and mounting points are maintained, which facilitates installation in the engine bay and minimizes stress on the radiator and oil cooler ports.

Construction and fitment for BMW 1 and 3 Series LCI

The hose belongs to the Cooling System Hoses and Pipes category, meaning its construction is adapted for operation at elevated temperatures and in contact with coolant and transmission oil. The hose profile is matched to the geometry of the engine bay in the BMW F20, F21, and F30 LCI models, ensuring proper clearance relative to other components.

The factory hose ends allow for a tight connection to the radiator and transmission oil cooler, limiting the risk of leaks and pressure drops in the circuit. This is particularly important in vehicles driven dynamically, where the cooling system operates under higher thermal loads.

Benefits of using an original BMW hose

Using an original hose instead of a worn or aftermarket component provides a number of practical benefits:

• maintenance of the factory hose routing in the engine bay,
• reduced risk of interference with other components (fan, covers, wiring harnesses),
• secure, leak-proof connections at the radiator and oil cooler ports,
• consistency with other BMW cooling system components.

As a result, this hose represents a safe service solution for users who expect predictable transmission cooling performance and wish to keep their vehicle in a configuration close to factory specifications.

Component condition and service application

The offered hose is a used part, making it an attractive cost-effective alternative to new OEM components while maintaining the original design and fitment. This type of part is suitable for both standard service replacements and repairs following mechanical damage to the front of the vehicle.

Replacing the hose is recommended in situations where there are signs of abrasion, cracking, leaks, or if the transmission cooling system has been previously modified unprofessionally. Installing an original hose helps restore proper fluid circulation and stable operating conditions for the transmission.

Technical support and additional materials

To better understand the impact of efficient cooling hoses on the safety of the engine and transmission, it is worth checking out the guide on our blog: Engine cooling system – overheating, repair, and used radiators. The article explains the relationship between operating temperature and the durability of key components.

If you are considering a choice between new and used OEM components, the following comparison material may also be helpful: New or used? A comparison of costs and quality of car parts, where we discuss the differences in cost-effectiveness and durability of various solutions.

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 pipes, hoses, or connectors, check out the available parts in the BMW Cooling System Hoses and Pipes category.