BMW E65/E66 7 Series Lower Radiator Coolant Hose Pipe – OEM Replacement Cooling System Hose, Replaces OE 17127521778 - Fits 2004–2008 7 Series Sedan Models

Restore proper coolant flow and cooling system reliability with this OEM replacement Lower Radiator Coolant Hose Pipe, designed to replace OE part number 17127521778 on select BMW 5, 6, and 7 Series models. This hose plays an important role in routing coolant through the lower portion of the cooling system, helping the engine maintain proper operating temperature and stable cooling performance under daily driving and heavier load conditions.

As these BMWs age, original coolant hoses can begin to harden, weaken, swell, or crack from repeated heat cycles and long-term coolant exposure. Once that happens, even a small weak point can quickly turn into a coolant leak, pressure loss, or overheating issue. Replacing aging lower radiator hoses before they fail is one of the smartest preventative maintenance steps you can take to protect the engine and cooling system.

This replacement hose pipe is designed to match the original fit and routing of the factory unit, making it a dependable solution whether you are fixing a leak, refreshing the cooling system, or replacing worn original hoses as preventative maintenance. It helps restore confidence in the cooling system while keeping the engine bay functioning the way it should.

Key Features:

• Direct OEM Replacement: Designed to replace the factory lower radiator coolant hose pipe using OE part number 17127521778.
• Restores Proper Coolant Flow: Helps maintain correct coolant circulation through the lower cooling system.
• Ideal for Cooling System Refreshes: A smart replacement when servicing aging hoses, radiator components, or the full cooling system.
• Helps Prevent Leaks and Overheating: Replacing worn hoses can help reduce the risk of coolant loss and temperature-related engine issues.
• OEM-Style Fitment: Built to match the original hose routing and installation layout on compatible BMW applications.
• Reliable Preventative Maintenance Upgrade: A simple but important replacement part for helping preserve long-term cooling system reliability.

FITMENT:

• BMW 5 Series – E60 Sedan (07/2004–02/2007)
• BMW 5 Series – E61 Touring (07/2004–02/2007)
• BMW 6 Series – E63 Coupe (02/2004–07/2007)
• BMW 6 Series – E64 Convertible (03/2004–07/2007)
• BMW 7 Series – E65 Sedan SWB (06/2004–07/2008)
• BMW 7 Series – E66 Sedan LWB (07/2004–07/2008)

Compatible with BMW applications using OE lower radiator coolant hose pipe 17127521778. If you’re unsure whether this hose matches your specific vehicle, please contact us with your VIN and we’ll be happy to verify compatibility before you order.

REPLACES OE PART NUMBER:
17127521778

Please refer to the “Fitment” section in the product description for compatibility details.