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

Visual condition of the part

The product shows signs of use visible in the photos.

BMW F20 F21 F30 F31 LCI Thermostat Water Pump B38 B48 Petrol Engine is a component from the Thermostats and housings group, designed for BMW F-series petrol engines with B38 and B48 units. Integrating the thermostat function with the coolant pump allows for precise management of the engine's operating temperature, which promotes stable parameters and safe operation.

Specifications and technical data

• SKU: 7644811-2
• 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 presented thermostat and water pump assembly is designed to work with B38 and B48 petrol engines in the F30 LCI body. It is responsible for forcing the circulation of coolant and controlling its flow depending on the temperature, which is crucial for maintaining stable engine operation, reducing the risk of overheating, and improving thermal efficiency.

Thanks to the factory OEM design, the cooling system maintains proper pressure and flow, and temperature control is carried out in accordance with the engine's operating maps. This allows for maintaining the right balance between performance, fuel consumption, and component durability.

Construction of the thermostat and water pump assembly

The thermostat integrated with the water pump forms a compact module mounted directly in the engine area. This solution reduces the number of connections, minimizes the risk of leaks, and facilitates the servicing of the entire cooling system as a single unit. The housing is adapted to operate at high temperatures and in contact with coolant, and internal flow channels ensure even distribution of the liquid.

The module uses solutions characteristic of modern BMW units, where precise temperature regulation affects engine smoothness, exhaust emissions, and the protection of mechanical engine components.

Benefits of using an original BMW component

Using the original thermostat and water pump module dedicated to the BMW F30 LCI with B38/B48 petrol engines ensures:

• proper fitment to factory mounting points and cooling system connectors,
• compliance with engine operating parameters and engine control unit software,
• stable operating temperature, which promotes smooth operation and reduces the risk of localized overheating,
• maintenance of the factory engine heating and cooling characteristics.

For the user, this means predictable vehicle behavior, proper operating conditions for engine oil, and less strain on other cooling system components.

Condition of the component and service application

The offered module comes from the used parts group, which allows for an economical repair of the cooling system while maintaining the manufacturer's original specifications. This is a particularly beneficial solution for comprehensive service work on vehicles that are used intensively or have higher mileage, where replacing the entire thermostat and water pump assembly is technically justified.

The selection of the component for a specific B38 or B48 petrol engine configuration in a BMW F30 LCI should always be verified based on vehicle data and manufacturer specifications, which minimizes the risk of incorrect installation.

Cooling system expansion and technical knowledge

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

For those considering broader service work on the vehicle's mechanical systems and wanting to better understand the differences between factory solutions and alternatives, an article describing the selection and operation of used components may be helpful, available here: Standard vs. sports suspension – design differences and is it worth buying used suspension parts?.