Gates 51399 Radiator Coolant Hose - Upper

Gates 51399 Molded Coolant Hose for BMW X5/X6

The Gates 51399 molded coolant hose is built for specific BMW cooling system applications and follows OE-style routing and connection points. It is a direct-fit radiator coolant hose solution for upper hose service on select BMW X5 and BMW X6 models.

Key Features

• Gates Molded Coolant Hose line for application-specific cooling system replacement
• Constructed from EPDM, plastic, and steel for use in engine coolant routing
• Molded design with a branch and 3 female quick connectors
• Upper radiator coolant hose configuration
• Direct replacement part number 51399 for select BMW X5 and BMW X6 applications
• OE-style modular hose construction with integrated components

Product Details

Gates 51399 is a molded radiator coolant hose designed for modular cooling system layouts that use integrated OE-style components such as branches and quick-connect fittings. The hose features a molded shape, a single branch, and three female quick connectors to match the routing and connection requirements used on select BMW cooling systems. It measures 1.5 in. at End 1 and End 2, with a 0.8 in. End 3 inside diameter and a 13 in. centerline length. This part cross-references Dayco 73102 for the same application.

Compatible With 2011-2018 BMW X5, upper and 2008-2018 BMW X6, upper. The Gates 51399 part number is commonly searched for BMW X5 upper coolant hose replacement and BMW X6 upper radiator hose replacement when servicing molded cooling assemblies.

Common Replacement Reasons

• Cracked or brittle coolant hose material
• Coolant leaks at molded sections or connector points
• Damaged quick-connect fittings on the upper hose assembly
• Cooling system service on BMW X5 or BMW X6 models
• Loss of proper coolant flow through the upper radiator circuit

Installation Notes

Verify the hose routing, connector style, and engine-side fitment before installation. This molded hose uses three female quick connectors and is intended for vehicles that match the OE-style modular layout. Inspect mating ports, seals, and adjacent cooling components for wear before reassembly to help ensure a proper seal and correct coolant circulation.

Quality Assurance

Gates is a recognized aftermarket supplier in modular coolant hose assemblies, and this molded hose is manufactured to application-specific specifications that mirror OE-style component integration for the listed BMW fitments.