Dayco 71509 Radiator Coolant Hose - Lower

Dayco Curved Radiator Hose 71509

Dayco 71509 is a curved radiator coolant hose built from EPDM for dependable coolant transfer in the engine cooling system. This dual I.D. hose measures 2 1/2 inches on one end and 3 inches on the other, making it a practical OE-style replacement for select Ford, Motorcraft, and related applications.

For buyers searching for a curved radiator hose for Ford truck and van cooling system service, Dayco 71509 offers the correct dual-diameter layout and SAE J20R4 Class D-1 / SAE J1684 Type EC compliance. It is a black radiator hose with no heat shield and no protective sleeve.

Key Features

• Brand: Dayco Curved Radiator Hose
• Part number: 71509
• EPDM construction for coolant hose service
• Dual I.D. hose design: 2 1/2 in. to 3 in.
• Black finish for a clean OE-style appearance
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Product Details

Dayco 71509 is a radiator coolant hose engineered as a curved dual I.D. hose for applications that require a 2 1/2-inch connection on one end and a 3-inch connection on the other. The EPDM rubber construction is suited for hot coolant circulation, while the curved shape helps route coolant through tight engine bay layouts. This part number is commonly searched as Dayco 71509 radiator hose, Ford radiator hose 71509, and curved coolant hose for Ford truck applications.

Dayco’s Curved Radiator Hose line focuses on replacement hoses that match the size and routing needs of OE cooling systems. If you are servicing a Ford truck or van cooling circuit and need a dual-diameter upper or lower hose configuration, Dayco 71509 is the type of hose to verify against the original part before installation.

This part cross-references Motorcraft KM2397 and Gates 22062 for the same application.

Common Cooling System Issues It Can Address

• Cracked or hardened radiator hose material
• Coolant leaks at a worn hose connection
• Incorrect hose diameter at one end of the cooling circuit
• Collapsed or softened hose sections from age and heat
• Service replacement for a damaged curved coolant hose

Installation Notes and Tips

Confirm end diameters, hose routing, and overall length against the removed hose before installation. Inspect clamps, necks, and adjoining coolant pipes for corrosion or wear, and replace any damaged sealing surfaces before refilling the cooling system. After installation, refill with the correct coolant and check for leaks at operating temperature.

Compatible with select Ford truck and van cooling system applications; verify against the original hose profile and dimensions for proper fit. Search terms often used for this part include Ford radiator hose replacement, Dayco 71509 coolant hose, and dual I.D. curved radiator hose for Ford.

Quality Assurance

Dayco manufactures cooling system hoses to meet published SAE specifications for radiator hose service. Part number 71509 is built to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for radiator coolant hose applications.