BMW F10 F11 F12 F13 Filler Neck Expansion Tank Coolant Hose Petrol 7591692

BMW F10 F11 F12 F13 Coolant Expansion Tank Cap is an original cooling system component designed for BMW models with gasoline engines. It ensures a tight seal for the expansion tank, stabilizing system pressure and supporting the safe operation of the powertrain. This is a practical service solution for users who want to restore the proper functioning of the cooling system without unnecessary modifications.

Specifications and technical data

• SKU: 7591692
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7591692
• Substitutable numbers: 7591692, 17137591692
• Fuel type: Petrol
• Part type: Hose
• Category: Coolant Hoses

Function of the Expansion Tank Cap in BMW

The cap for the coolant expansion tank is responsible for maintaining the correct pressure in the cooling system and controlling fluid circulation. In BMW F10, F11, F12, and F13 series vehicles, it is crucial for:

• preventing coolant loss through a leaky seal,
• stabilizing the operating temperature of the gasoline engine,
• protecting components such as lines, hoses, and the radiator from excessive pressure,
• maintaining the proper operation of the entire cooling system in urban and highway conditions.

A well-chosen cap for a specific BMW generation minimizes the risk of engine overheating and uncontrolled fluid leaks.

Intended Use and Compatibility with the Cooling System

The presented cap is a component from the Cooling System Hoses and Lines group, working directly with the expansion tank in BMW F10, F11, F12, and F13 models powered by gasoline. Its design is adapted to the factory cooling system of these vehicles, allowing for:

• installation in place of the original cap without additional adaptations,
• maintaining the factory parameters of the cooling system,
• consistency with other components – lines, hoses, and the radiator.

This makes the cap a convenient service solution for replacing a worn or leaky component, without altering the vehicle's structure.

Characteristics of the Used BMW Part

The offered cap comes from the original BMW parts line, which means factory fit for the expansion tank thread and seat. As a used part, it is a good choice for drivers seeking a reasonable compromise between cost and adherence to manufacturer specifications. This type of component is particularly useful when:

• the current cap shows signs of seal wear,
• there are pressure fluctuations or leaks around the expansion tank in the cooling system,
• a quick replacement of the component is necessary without waiting for new aftermarket parts.

A used, original cap helps maintain the consistency of the cooling system with other factory BMW components.

Importance for Cooling System Safety

A functional expansion tank cap directly impacts the thermal safety of the engine. In BMW vehicles with gasoline engines, it is responsible for:

• controlling the working pressure in the cooling system,
• reducing the risk of engine overheating under heavy load,
• maintaining the correct fluid level in the expansion tank.

Replacing a worn cap is a simple yet effective service action that can prevent costly failures related to engine overheating.

Technical Support and Additional Information

To better understand how the expansion tank cap works with other cooling system components and what symptoms may indicate problems with engine operating temperature, it is worth reading the guide on our blog: Engine Cooling System – Overheating, Repair, and Used Radiators. The article helps correlate symptoms with specific system components, facilitating accurate diagnostics.

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other parts from the same group, such as coolant lines, hoses, or connectors, check the available parts in the BMW Cooling System Hoses and Lines category.