BMW 1 Series E87 N45 N46 Line Heater Return Thermostat Engine Cooling 7548242

BMW E87 N45 N46 Thermostat Hose Pipe 7548242 is an original cooling system component, designed for precise connection of the thermostat to other components in N45 and N46 engines. As part of the Cooling System Hoses and Pipes category, it ensures proper coolant flow and stable operating conditions for the power unit. A used OEM part is a sensible choice for drivers seeking a technically matched solution at an attractive price.

Specifications and technical data

• SKU: 7548242
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7548242
• Substitutable numbers: 17127548242, 7548242, 17127525026, 7525026, 64319353041, 9353041, 64319206484, 9206484
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The thermostat water hose in BMWs with N45/N46 engines is responsible for the controlled transport of coolant between the thermostat and the rest of the system. The correct shape and inner diameter of the hose allow for maintaining a stable engine operating temperature, which reduces the risk of overheating and uneven heating of the block and head.

A properly selected hose:

• ensures a sealed connection with the thermostat and cooling system spigots,
• maintains proper coolant flow under various engine loads,
• minimizes the risk of leaks and pressure drops in the system.

Original BMW Fitment

The hose is a BMW OE part, meaning it retains the factory geometry, diameters, and mounting points. This allows for installation without modifications, and the hose follows the factory routing in the engine bay. The original design reduces the risk of rubbing against other components, which is important for the durability of the entire cooling system.

The product has a dedicated OEM part number and related replacement numbers, which facilitates verification of compatibility with your specific vehicle configuration. When selecting, it is advisable to compare the designations with the service documentation or the number of the removed part.

Condition, Inspection, and Preparation for Installation

The part is used, which helps reduce repair costs while maintaining original manufacturer specifications. This type of hose should be thoroughly inspected before reinstallation for:

• absence of cracks and abrasions on the walls,
• condition of the spigots and ends that interact with the clamps,
• sealing at potential bend points.

When replacing the hose, it is also recommended to check the condition of the clamps and the overall condition of the coolant to avoid repeated interventions in the system in a short period.

Benefits of Using an Original Thermostat Hose

Using a hose dedicated to the BMW E87 with N45/N46 engines offers a number of practical benefits:

• Factory Fitment – no issues with hose length, diameter, or bend angle.
• Stable Cooling System Operation – proper coolant flow reduces the risk of engine overheating.
• Savings – a used OEM part is a compromise between quality and repair cost.

This solution is particularly recommended for comprehensive cooling system service, e.g., along with thermostat or coolant replacement.

Related Hoses and Cooling System Knowledge

If you are looking for other BMW Cooling System Hoses and Pipes, check out the BMW cooling system hoses and pipes available in our store to find a complete solution for your model.

For a better understanding of the impact of hoses, thermostats, and radiators on engine durability, it is worth reading the guide: Engine Cooling System – Overheating, Repair, and Used Radiators. The article explains how to properly diagnose engine operating temperature problems and when replacing cooling system components is necessary.