Coolant Hose BMW E81 E87 LCI Diesel N47 Radiator Bottom Pipe Line 7796870

Coolant Hose BMW E81 E87 LCI Diesel N47 Radiator Bottom Pipe Line is a component from the Cooling system hoses and pipes group, designed for BMW models with a diesel engine. It is responsible for the stable flow of coolant, which directly impacts the safe operating temperature of the power unit and the durability of the equipment.

Specifications and technical data

• SKU: 7796870-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7796870
• Substitutable numbers: 17127796870, 7796870, BG
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and function in the cooling system

The presented water hose is a cooling system component dedicated to the BMW E81 and E87 series with a diesel engine. Its task is to route coolant between individual system components, such as the radiator, engine block, or other circuit elements, which helps maintain stable thermal conditions during city and highway driving.

Thanks to its precisely selected shape and diameter, the hose ensures proper flow of the cooling medium, reducing the risk of local overheating and pressure drops in the installation. This is particularly important in modern diesel units, where the cooling system operates under increased thermal load.

Benefits of using an original BMW hose

Using a hose from the BMW range means maintaining factory geometry, mounting points, and compatibility with other system components. This reduces the risk of leaks, material stress, or collisions with other parts in the engine bay.

The main advantages of this solution include:

• factory fit for the cooling system in BMW E81/E87 with a diesel engine,
• maintaining the correct routing of the hose in the engine bay,
• stable coolant flow under typical operating conditions,
• easier installation thanks to compatibility with original brackets and connectors.

An element from this group is particularly important in the event of symptoms such as fluid leaks, a drop in coolant level, or visible damage to the rubber, as a leaking hose can lead to engine overheating.

Condition and service application

The offered hose comes from a used vehicle, which allows for an economical repair of the cooling system while maintaining the original part specification. This type of component is often chosen for:

• repairs after a cooling system failure,
• preventive replacement of worn hoses,
• restoring the factory configuration after previous modifications.

In the case of diesel units, it is particularly important that the hoses maintain tightness and resistance to temperature changes, as long-term driving under load generates high demands on the entire cooling circuit.

Technical support and component selection

Before purchasing, it is worth comparing the shape and connection points of the hose with the element currently installed in the car to confirm compatibility with the specific engine version and model year. Manufacturer markings and part numbers visible in the technical specifications tab may also be helpful.

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 additional lines, flexible hoses, or pipes carrying coolant, check the available parts in the BMW cooling system hoses and pipes category.

To better understand the symptoms of overheating, the impact of hose tightness on system operation, and good service practices, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. This will make it easier to assess when a hose replacement is necessary and how to take care of the entire cooling system in your car.