BMW F20 F21 F30 LCI Petrol B58 M140i 340i Electric Thermostat Module 7642854

Visual condition of the part

The product shows signs of use visible in the photos.

BMW F20 F21 F30 LCI Petrol B58 M140i 340i Electric Thermostat Module is an original component from the Thermostats and housings category, designed for B58 petrol engines in the high-performance M140i and 340i versions. Engineered by BMW, it ensures stable management of engine operating temperature, which translates into predictable performance and safe operation during daily driving as well as under higher loads.

Specifications and technical data

• SKU: 7642854-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7642854
• Substitutable numbers: 11537642854, 7642854
• Fuel type: Petrol
• Category: Thermostats & Housings

Application in B58 petrol engines

The presented thermostat is dedicated to the cooling system of modern B58 petrol engines in BMW 1 Series F20/F21 and 3 Series F30 LCI models in M140i and 340i versions. It is responsible for precise control of coolant flow, maintaining the operating temperature within the optimal range for turbocharged units, which is crucial for both component durability and power stability.

In high-performance vehicles such as the M140i and 340i, a properly functioning thermostat reduces the risk of overheating during dynamic driving and accelerates the time to reach operating temperature after a cold start, which promotes engine efficiency and improves lubrication conditions.

Technical characteristics and role in the cooling system

The thermostat from this series works with a cooling system designed specifically for petrol units where rapid response to load changes is essential. This component:

• controls the opening of the coolant circuit between the engine block and the radiator,
• supports the maintenance of a stable operating temperature under varying driving conditions,
• limits thermal fluctuations that can affect engine component wear,
• influences the correct operation of engine control unit strategies related to temperature.

Thanks to a design compliant with BMW requirements, the thermostat is matched to the flow and pressure characteristics of the B58 cooling system, which facilitates installation and integration with the factory setup.

Benefits of using an original BMW thermostat

Choosing an original BMW thermostat in the Thermostats and housings category allows you to maintain cooling system performance parameters in accordance with the manufacturer's specifications. This translates into:

• consistent operation with factory engine control software,
• proper fitment with hoses, housings, and other system components,
• reduced risk of leaks resulting from imprecise fitment,
• maintenance of predictable operating temperatures under high load.

This solution is particularly recommended for higher-power vehicles, where thermal stability has a direct impact on the durability of the turbocharger, seals, and auxiliary components.

Component condition and installation aspects

The offered thermostat is a used part, which allows for an economical repair of the cooling system while maintaining the original BMW specification. Before installation, it is recommended to perform a standard check of system tightness, inspect the condition of the hoses, and properly bleed the system after replacement to ensure correct coolant circulation.

Due to the importance of this component for the engine's thermal safety, the replacement should be carried out in accordance with the service procedures specific to F20, F21, and F30 LCI models with the B58 petrol engine, taking into account the correct routing of hoses and the proper tightening torque of the fasteners.

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, connectors, or additional flow control modules, check out the available parts in the BMW Thermostats and housings category.

For drivers interested in a broader perspective on the cost-effectiveness of using original used components in the drivetrain, the article on the advantages of factory OEM parts may be helpful – more information can be found in the material on the advantages of used OEM drivetrain components over unreliable replacements.