BMW E39 Petrol Bottom Radiator Water Hose 1740481

BMW E39 Petrol Bottom Radiator Water Hose is an original BMW component designed for use in the cooling system of a petrol engine. This used hose ensures the factory-specified coolant flow geometry, which promotes a stable engine operating temperature and proper interaction with other cooling system components.

Specifications and technical data

• SKU: 1740481
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1740481
• Substitutable numbers: 1740481, 11531740481
• Fuel type: Petrol
• Tire profile: 65535
• Category: Coolant Hoses

Purpose and function in the cooling system

The hose belongs to the Cooling system hoses and pipes category, responsible for transporting coolant between key engine components and the radiator. In petrol engines, stable fluid circulation has a direct impact on:

• maintaining the optimal engine operating temperature,
• reducing the risk of overheating under heavy load,
• even heat dissipation from the engine block and cylinder head.

By maintaining the original diameter and shape, the hose supports proper fluid flow, which is essential for both the durability of the engine and the correct operation of the thermostat and radiator.

Benefits of using an original BMW hose

Using a hose sourced from a BMW E39 cooling system allows you to maintain the factory operating characteristics of the entire circuit. In practice, this means:

• secure fitment to connectors and mounts in the engine bay,
• correct routing of the hose without unwanted kinks,
• preservation of the coolant flow path designed by the manufacturer.

For the user, this translates into stable cooling system operation and a reduced risk of leaks resulting from the poor fitment of universal aftermarket replacements.

Technical characteristics and compatibility

The hose is designed for use with petrol engines, which is significant due to the specific thermal conditions of such units. The component's construction is adapted to the operating pressure and temperatures present in the cooling system, as well as the limited installation space in the BMW E39 engine bay.

The part comes from a vehicle equipped with standard tire profiles, which indirectly confirms its use in a unit with a standard suspension and weight configuration, without extreme modifications affecting the thermal load of the system.

Condition of the component and service application

The hose is used, making it a sensible choice for budget-friendly repairs or restoring the factory configuration of the cooling system. It can be used both when replacing a damaged section of the installation and during the staged renovation of the entire coolant circuit in a BMW E39.

In practice, it will serve well as a service component in situations where the priority is to maintain the original hose geometry and compatibility with factory brackets and clamps.

Cooling system expansion and technical knowledge

For a better understanding of the impact of hoses on engine durability, it is worth reading material discussing common overheating problems and the role of individual cooling system components – this is described in detail in the article Engine cooling system – overheating, repair, and used radiators.

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 additional hoses, return lines, or sections connecting to the radiator, check out the available parts in the BMW cooling system hoses and pipes category.