BMW F20 F21 F30 F31 LCI B48 Hose Radiator Top Thermostat Coolant Water 8662836

BMW F20 F21 F30 F31 LCI B48 Water Hose Pipe Tube is an original cooling system component designed for modern B48 gasoline engines in facelifted BMW 1 and 3 Series models. With its factory geometry and precise fit to the connectors and routing in the engine bay, it ensures stable coolant flow and proper operation of the entire system. A used OEM component is a sensible choice for drivers looking for a proven cooling hose at an attractive price.

Specifications and technical data

• SKU: 8662836
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8662836
• Substitutable numbers: 17128662836, 8662836, EM
• Category: Coolant Hoses

Purpose and Role in the Cooling System

The water hose in this BMW model is responsible for directing coolant between system components, maintaining the stable operating temperature of the B48 engine. A properly shaped pipe minimizes the risk of kinks, flow restriction, and localized overheating, which directly impacts the durability of the engine and its ancillaries.

This item, from the BMW Cooling System Hoses and Pipes category, is crucial for addressing leaks, preventing pressure drops in the system, and restoring factory cooling parameters after repairs or modifications.

Construction and Fitment for BMW F20, F21, F30, F31 LCI

The hose has been specifically designed for the engine bay architecture of the facelifted BMW F20/F21 (1 Series) and F30/F31 (3 Series) models equipped with the B48 engine. This means:

• factory routing along original mounts and brackets,
• appropriate end diameters for the stock cooling system connectors,
• compatibility with the stock radiator and other hoses for the specific engine variant.

This ensures predictable installation and reduces the risk of leaks caused by ill-fitting shapes or diameters.

Benefits of Using an Original BMW Water Hose

Using an original water hose in the B48 cooling system allows for engine operating parameters to be maintained in accordance with the manufacturer's specifications. Key benefits include:

• Factory Fitment – no need for modifications, cutting, or adapting universal hoses.
• Stable Coolant Flow – appropriate stiffness and geometry reduce the risk of the hose collapsing under vacuum.
• Compatibility with Other Cooling System Components – the hose works seamlessly with the stock pump, radiator, and thermostat.
• Safe Engine Operation – a properly functioning cooling system reduces the risk of overheating and costly engine repairs.

Used Condition and Service Application

The offered hose is a removed part and is classified as a used OEM component. This is a good solution when the existing hose has suffered mechanical damage, cracking, or thermal deformation, and the priority is to quickly restore the cooling system's functionality while maintaining the part's factory specifications.

Before installation, standard checks for connection tightness and the condition of the clamps are recommended, as well as bleeding the cooling system according to the service procedure for B48 engines.

More About Cooling Systems and Good Service Practices

If you want to better understand how a properly functioning cooling system affects engine longevity and when hose replacement is particularly recommended, check out the article: Engine Cooling System – Overheating, Repair, and Used Radiators. You will find practical tips on diagnosing overheating issues and maintaining cooling components in various models.

Other BMW Cooling System Hoses and Pipes

If you are also looking for other BMW Cooling System Hoses and Pipes for your car, check out our dedicated offer: BMW Cooling System Hoses and Pipes. This will allow you to easily assemble a complete set of components necessary for comprehensive cooling system maintenance.