Coolant Hose BMW E70 E71 M57N2 Water Cooling Pipe Radiator 7798496

The BMW E70 E71 M57N2 Radiator Coolant Hose is a component from the Cooling System Hoses category, designed for BMW vehicles with the M57N2 diesel engine. This used genuine BMW part ensures proper coolant flow, stabilizing the engine's operating temperature and supporting safe vehicle operation.

Specifications and technical data

• SKU: 7798496
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7798496
• Substitutable numbers: 7798496, 17127798496, KZ
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The radiator hose in BMW E70 and E71 models with the M57N2 engine is responsible for the controlled flow of coolant between system components. A correctly selected hose:

• maintains the sealing of the cooling circuit under thermal and pressure loads,
• limits the risk of engine overheating,
• supports stable operation of the thermostat and radiator,
• ensures proper heat dissipation from the engine during city and highway driving.

Due to its specific fit for the M57N2 engine configuration, the hose maintains the correct shape, connection diameters, and routing geometry, which facilitates installation and minimizes stress within the system.

Compatibility and Technical Specifications

The presented radiator hose is designed for BMW E70 and E71 series vehicles equipped with the M57N2 engine. The product is assigned to the fuel type specified as petrol, allowing for precise matching to the specific engine version in the vehicle.

Original manufacturer markings and available replacement numbers are included in the technical specifications section – this allows for easy verification of compatibility with the BMW catalog and the existing installation in the car, without the need for guesswork regarding parameters.

Condition, Origin, and Benefits of Using a Used Part

The radiator hose comes from a dismantled BMW vehicle and is offered as a used part. This type of component, originating from genuine BMW production, retains its factory geometry, appropriate material flexibility, and correct connection diameters, which translates to:

• secure fit to radiator and engine spigots,
• stable mounting in factory brackets,
• reduced risk of leaks with proper installation.

Choosing a used cooling system hose is a cost-effective solution, especially for older BMW generations where both functionality and repair economy are important. Furthermore, reusing parts aligns with an approach that reduces workshop waste.

If you want to better understand the impact of functional hoses and radiators on engine durability, it's worth reading the article: Engine Cooling System – Overheating, Repair, and Used Radiators. You will find practical information there about the symptoms of overheating and the consequences of neglecting maintenance.

Why Choose an Original BMW Radiator Hose

An original BMW cooling system hose ensures consistency with the vehicle's factory design. In practice, this means:

• maintaining the coolant flow path as intended by the manufacturer,
• no need for modifications or fitting universal replacements,
• better synergy with other cooling system components, such as the radiator, water pump, or thermostat.

For users considering installing used parts in their car, the guide article might be helpful: Used Car Parts: Myths and Facts You Need to Know. The article explains in which situations choosing a dismantled component is technically justified.

Other BMW Cooling System Hoses

If you are also looking for other components from the BMW Cooling System Hoses category for your car, check out the BMW Cooling System Hoses available in our store. This will allow you to assemble a complete set of cooling components based on parts matched to your model.