Dayco 72744 Radiator Coolant Hose - Upper

Curved Upper Radiator Hose for BMW Cooling Systems

Dayco 72744 is a curved radiator coolant hose built for upper cooling-system routing on select BMW applications. Made from EPDM and finished in black, it follows the OE-style shape needed for a proper coolant path in BMW Z4, X1, 135i, 135is, 335i, 335i xDrive, 335is, 1 Series M, and 335xi models.

The Dayco Curved Radiator Hose line focuses on formed hose geometry and material selection for replacement cooling service. Part number 72744 is a single I.D. hose with matching 1 17/32-inch inside diameters at both ends and 1 5/8-inch outside diameters, helping maintain the correct fit in the upper radiator hose location.

Key Features

• EPDM construction for coolant-system service
• Curved radiator hose design for upper hose routing
• Black finish for a factory-style appearance
• Single I.D. hose with 1 17/32-inch inside diameter at both ends
• 1 5/8-inch outside diameter at both ends
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco 72744 replacement hose for select BMW cooling applications

Detailed Description

Dayco 72744 is a formed radiator coolant hose engineered for the upper position in the cooling circuit. Its curved profile supports the routing used on BMW upper radiator hose applications, including 2009-2016 BMW Z4, 2013-2015 BMW X1, 2008-2013 BMW 135i, 2013 BMW 135is, 2007-2013 BMW 335i, 2009-2013 BMW 335i xDrive, 2011-2013 BMW 335is, 2011 BMW 1 Series M, and 2007-2008 BMW 335xi. This part cross-references BMW 17.12.7.540.127 and Gates 24267 for the same application.

What It Helps Address

• Cracked or hardened upper radiator hose material
• Coolant leaks at the hose body or connection points
• Incorrect hose shape after prior replacement
• Restricted coolant flow caused by a deteriorated hose
• Cooling-system service on BMW upper hose routing

Installation Notes and Tips

Verify the hose routing, end diameters, and upper-position fitment before installation. Inspect the mating necks, clamps, and surrounding cooling components for wear or corrosion, and replace any damaged sealing surfaces during service. Confirm the hose is seated fully and routed without twist or contact with hot or moving components.

Quality Assurance

Dayco manufactures this hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and performance standards for cooling-system replacement service.