Coolant Hose BMW X3 G01 X4 G02 Diesel B57 Water Pump Line Aux Heating 9354462

BMW X3 G01 / X4 G02 Diesel Coolant Hose – Water Pump to Auxiliary Heater Line is an original cooling system component designed for B57 diesel engines in BMW vehicles. Designed as a factory hose connecting the water pump circuit to the auxiliary heating system, it ensures stable coolant flow and proper cooperation of all thermal components. This is a practical solution for users who want to maintain compliance with factory specifications and avoid engine overheating or underheating issues.

Specifications and technical data

• SKU: 9354462
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9354462
• Substitutable numbers: 9354462, 64219354462
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and Function in the Cooling System

This hose belongs to the group of Cooling System Hoses and Pipes and is part of the coolant circuit in the B57 diesel engine used in the BMW X3 G01 and X4 G02. It is responsible for directing coolant between the water pump and the auxiliary heating system, which is important for both engine temperature stabilization and cabin thermal comfort.

A properly functioning hose in this area:

• ensures adequate coolant flow during standard engine operation,
• enables efficient cooperation with the auxiliary heater system,
• reduces the risk of localized overheating around the water pump and accessories,
• maintains the circuit's integrity, which is crucial for engine longevity.

Benefits of Using an Original BMW Hose

As a BMW branded part, this hose has been designed for the specific architecture of the B57 engine and the X3 G01 / X4 G02 body styles. This means:

• precise geometric fit to factory mounting points and spigots,
• maintenance of the correct diameter and flow cross-section,
• compatibility with the stock water pump and auxiliary heating system.

This ensures a predictable installation process without the need for modifications or adapters, and the cooling system retains near-factory performance parameters.

Condition and Practical Application

The offered hose is a used original component, allowing for the preservation of factory design while offering a cost-effective repair solution. This is particularly attractive for servicing modern diesel engines with complex and precisely tuned cooling systems.

Hose replacement is recommended in situations where:

• signs of wear, cracks, or deformation are visible on the old component,
• coolant leaks are present around the water pump or auxiliary hoses,
• the auxiliary heater system is not operating stably due to coolant flow issues.

Technical Support and Cooling System Knowledge

To better understand the impact of hoses and pipes on engine longevity, it is worth consulting a guide on cooling system diagnostics and service – it thoroughly discusses the effects of overheating and the importance of functional components in various models, including BMW. Practical tips can be found in the article Engine Cooling System – Overheating, Repair, and Used Radiators.

BMW Cooling System Service Extension

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as additional hoses, return pipes, or heater connections, check the available parts in the BMW Cooling System Hoses and Pipes category.