BMW 3 X3 X5 Series E83 LCI E46 E53 Thermostat Expansion Tank Radiator 2249366

BMW 3 X3 X5 Series E83 LCI E46 E53 Thermostat Expansion Tank Radiator is an original BMW cooling system component, designed for precise integration with the radiator and expansion tank. This used part from the Thermostats and Housings category allows for a technically correct repair of the cooling system without the need for aftermarket replacements with uncertain specifications.

Specifications and technical data

• SKU: 2249366
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2249366
• Substitutable numbers: 17112249366, 2249366, EM
• Category: Thermostats & Housings

Purpose and function in the cooling system

The presented BMW 3 X3 X5 Series E83 LCI E46 E53 Thermostat Expansion Tank Radiator is dedicated to selected BMW 3, X3, and X5 series models, including the E83 LCI, E46, and E53 generations. Its task is to stabilize the coolant flow between the radiator and the expansion tank, which translates into maintaining the optimal engine operating temperature and uniform heat dissipation under various load conditions.

A properly selected element from the Thermostats and Housings group reduces the risk of engine overheating, system airlocks, and uncontrolled temperature fluctuations, which directly impacts engine durability and vehicle operating comfort.

Construction, fitment, and installation

As an original BMW part, the thermostat has been designed for precise fitment with the factory cooling system in the listed models. This includes appropriate connector shapes, mounting points, and housing geometry, which facilitates installation in place of the worn component without the need for modifications.

This solution is particularly beneficial for workshops and users expecting predictable cooling system behavior after replacement. Using a component from the same design group minimizes the risk of leaks, venting issues, and improper thermostat operation in extreme temperatures.

Benefits of using an original BMW thermostat

• Structural compatibility – a part developed for specific BMW 3, X3, and X5 generations, which facilitates selection and installation.
• Stable cooling system operation – correct management of coolant flow between the radiator and the expansion tank.
• Reduced risk of overheating – proper regulation of the engine's operating temperature in city traffic and on the highway.
• Seamless integration with existing hoses and housings – no need for adapters or modifications.
• A solution preferred by professional service centers – predictable operating parameters and easier diagnostics in the future.

Part condition and service application

The item is offered as a used original BMW component, which represents a reasonable compromise between repair costs and maintaining the factory cooling system specifications. This type of part is suitable both for standard replacement of a worn thermostat and for broader service work involving the radiator, expansion tank, or coolant hoses.

For workshops and users servicing their vehicles independently, it is important that the product comes from the Thermostats and Housings group, which facilitates its correct identification and selection according to the specific engine configuration.

Repair expansion and additional information

If you are planning a comprehensive repair or upgrade of your BMW's engine bay and need other elements from the same group, such as additional thermostats, housings, or connection elements, check out the available parts in the BMW Thermostats and Housings category.

When selecting used cooling system components, it is worth following proven verification and identification procedures based on catalog numbers and manufacturer markings – practical tips can be found in the guide Safe purchase of used car parts online – a step-by-step guide, prepared for drivers and professional service centers.