Dayco 72578 Radiator Coolant Hose - Upper

Dayco 72578 Curved Radiator Hose

Dayco 72578 is a curved upper radiator coolant hose built for specific Ford, Mazda, and Mercury applications. It uses EPDM construction and a dual I.D. design to match the factory hose routing and connection sizes needed for proper cooling system service.

Key Features

• EPDM rubber construction for coolant system use
• Black finish
• Dual I.D. hose design
• End 1 inside diameter: 1 1/4 in.
• End 2 inside diameter: 1 1/2 in.
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved radiator hose profile for upper hose routing

Product Details

This Dayco Curved Radiator Hose is engineered for upper radiator hose service on 2009-2012 Ford Escape, 2009-2011 Mazda Tribute, and 2009-2011 Mercury Mariner. The curved shape supports the original hose path, while the dual inside diameter design addresses the different connection sizes used in the cooling circuit. Dayco 72578 is a direct-fit cooling system hose for owners servicing a Ford Escape upper radiator hose or replacing the factory hose on a Mazda Tribute or Mercury Mariner.

Dayco’s Curved Radiator Hose line focuses on application-specific hose geometry and OE-style sizing for cooling system maintenance. Part number 72578 is built to meet the dimensional and material requirements expected in radiator coolant hose replacement, with EPDM selected for coolant exposure and everyday underhood conditions.

This part cross-references Duralast E72578 and Goodyear 66147 for the same application.

Common Repair Uses

• Replacing a cracked or softened upper radiator hose
• Restoring coolant flow after hose swelling or collapse
• Addressing coolant leaks at the hose connection points
• Correcting hose fitment issues on the Ford Escape, Mazda Tribute, or Mercury Mariner
• Servicing a worn factory-style curved coolant hose

Installation Notes

Verify the hose routing, end diameters, and upper hose position before installation. Inspect the radiator neck, engine outlet, and clamps for wear or corrosion, and confirm the cooling system is fully cooled and drained before removing the old hose. Proper seating at both ends is important for a secure seal and reliable coolant transfer.

Quality Assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator coolant hose applications. EPDM construction and application-specific sizing support consistent fitment for the listed vehicles.