Gates 51397 Radiator Coolant Hose - Upper

Gates 51397 Molded Coolant Hose

The Gates 51397 molded coolant hose is built for upper radiator coolant routing on select BMW applications. It uses molded EPDM construction with integrated plastic and steel components to match the shape and connection style required for the vehicle cooling system.

Key Features

• Gates Molded Coolant Hose line for application-specific cooling system fitment
• Fits 2013-2018 BMW X3, upper
• Fits 2015-2018 BMW X4, upper
• EPDM, plastic, and steel construction for coolant service use
• Centerline length: 16.5 in. (419 mm)
• End 1 inside diameter: 1.25 in. (32 mm)
• End 2 inside diameter: 1.25 in. (32 mm)
• Modular hose design with 2 female quick connectors and 2 male quick connectors
• Molded design with 4 quick connect fittings

Product Details

Gates 51397 is a molded radiator coolant hose engineered for specific BMW upper hose applications. As part of the Gates Molded Coolant Hose product line, it follows an OE-style modular layout that incorporates the connection points and routing needed for the cooling circuit. This part number is listed for 2013-2018 BMW X3 upper coolant hose service and 2015-2018 BMW X4 upper coolant hose service. The Gates 51397 part number is also cross-referenced to Four Seasons 73105 for the same application.

Common Cooling System Issues

• Cracked or leaking upper radiator hose
• Coolant loss from worn quick-connect hose connections
• Improper hose routing after hose deterioration
• Softening, swelling, or heat damage in the coolant hose
• Cooling system service needs on BMW X3 and BMW X4 models

Installation Notes and Tips

Verify the vehicle year, model, and upper hose routing before installation. Inspect the mating quick-connect fittings, seals, and nearby cooling components for wear or contamination before connecting the new hose. Confirm the hose is fully seated at each connection point and routed to avoid kinks, abrasion, or contact with hot engine components.

Quality Assurance

Gates is a recognized automotive aftermarket supplier in modular coolant hose assemblies, and this hose is manufactured to application-specific specifications with OE-style integrated components for the listed BMW fitments.