Thermostat Water Pump BMW F20 F21 F30 F31 LCI B38 B48 Petrol Engine 7644811

Thermostat Water Pump BMW F20 F21 F30 F31 LCI B38 B48 Petrol Engine is an original cooling system component designed for petrol units, ensuring stable engine operation across a wide range of loads. Thanks to the factory BMW design and precise coolant flow control, this thermostat and water pump assembly supports safe performance and predictable behavior of B38 and B48 units. This solution is particularly beneficial for professional repairs where compliance with factory standards, operational consistency, and certainty of fitment within the cooling system are essential.

Specifications and technical data

• SKU: 7644811-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7644811
• Substitutable numbers: 11537644811, 7644811
• Fuel type: Petrol
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat and water pump assembly in the BMW F30 LCI model with B38 and B48 engines is responsible for controlling the operating temperature of the power unit and forced coolant circulation. A properly functioning component in this group:

• maintains the optimal operating temperature of the petrol engine,
• reduces the risk of overheating under heavy loads,
• supports stable operation in both city and highway conditions,
• indirectly influences fuel consumption and engine refinement.

Thanks to the factory design for the F30 LCI series, the system works with the original cooling architecture, which helps maintain predictable operating parameters and consistency with the factory control software.

Benefits of using an original BMW thermostat and water pump

Choosing an original BMW component in the Thermostats and housings category allows for compliance with factory design specifications. In practice, this means:

• proper fitment to cooling system ports and hoses,
• the correct thermostat opening characteristics for petrol engines,
• compatibility with sensors and electronic control of B38/B48 units,
• preservation of factory engine heating and cooling parameters.

For BMW F30 LCI users, this translates into more predictable vehicle behavior after repair, reduced risk of cooling system malfunction, and easier diagnostics in the future, as operating parameters remain consistent with the manufacturer's documentation.

Installation characteristics and application in petrol engines

The presented thermostat and water pump assembly is designed for units powered by petrol, which is important when selecting parts within the BMW engine range. Using the correct component for the specific fuel type:

• ensures appropriate thermal characteristics for petrol engines,
• minimizes the risk of incompatibility with engine control unit maps,
• facilitates service work due to the predictable procedure for bleeding and testing.

The element is structurally prepared for operation in modern BMW units, where the cooling system works with an advanced temperature management system, which helps maintain stable operating parameters.

Condition, verification, and service application

The offered component comes from the used parts group, which allows for economical repair while maintaining the original BMW design. This type of solution is often chosen in situations where:

• a quick replacement of a damaged cooling system component is necessary,
• compliance with the factory design and engine equipment is important,
• a balance between repair cost and the quality of parts used is essential.

In practice, using an original, used thermostat and water pump assembly can be beneficial, especially in vehicles used intensively, where consistency with the existing engine configuration and predictable cooling system behavior after installation are key.

Expanding repairs within the BMW cooling system

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as thermostat housings, thermostatic modules, or additional bodies, check the available parts in the BMW Thermostats and housings category.

When planning broader service work, it is also worth checking out practical tips regarding the selection and installation of used parts – an article describing when such a solution is most economically and technically rational may be helpful, available here: Volkswagen – solidity and reliability. Why are used VW parts a reasonable choice?.