Thermostat Coolant Pipe BMW E87 E90 E91 Hose Radiator Bottom 7531581

Thermostat Coolant Pipe BMW E87 E90 E91 Hose Radiator Bottom is an original cooling system component designed for the N52 engine family in BMW 1 and 3 Series models. Thanks to its factory geometry and precisely selected diameter, it ensures stable coolant flow and proper heat dissipation from the power unit. This is a practical solution for users who want to restore the correct operation of the cooling system without compromising on fitment.

Specifications and technical data

• SKU: 7531581
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7531581
• Substitutable numbers: 17127531581, 7531581
• Category: Coolant Hoses

Purpose and function in the cooling system

The water hose dedicated to N52 petrol engines in BMW E87, E90, and E91 is responsible for safely routing coolant between cooling system components. The correct shape and length of the hose are crucial for:

• maintaining proper pressure in the fluid circuit,
• ensuring patency and uniform flow,
• reducing the risk of engine overheating.

Using a component with the correct specification is particularly important in N52 engines, which require efficient heat dissipation in both city and highway driving conditions.

Construction and fitment for BMW 1 and 3 Series

The offered hose belongs to the Cooling system hoses and pipes group, meaning it has been designed to operate in high-temperature environments and in contact with coolant. The shape of the hose is adapted to the factory routing in the engine bay of the BMW E87, E90, and E91, which facilitates installation and minimizes material stress during operation.

Its original BMW origin promotes compatibility with factory connectors, clamps, and other cooling system components, which translates into connection tightness and a reduced risk of leaks.

Benefits of using an original BMW hose

Using a water hose that complies with factory specifications allows you to:

• maintain the correct operating temperature of the N52 engine,
• reduce the risk of failures resulting from overheating,
• maintain consistency with the BMW cooling system design,
• eliminate the need for modifications and fitting universal hoses.

For users who prioritize technical correctness and predictable system behavior, choosing an original hose is a safe and functional solution.

Condition and service application

The item comes from disassembly and is intended for reinstallation in BMW vehicles with the N52 engine that show signs of hose wear, such as cracks, material softening, or localized leaks. Replacing the water hose is recommended during any major cooling system intervention, especially when there are signs of material aging or previous repairs.

Selecting the correct hose for a specific engine and body version allows for efficient service work and reduces vehicle downtime.

Expansion and service of the BMW cooling system

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

To better plan service work and understand the impact of an efficient fluid circuit on engine durability, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. This will help you better assess when replacing a water hose is necessary and how to combine it with other maintenance tasks.