Dayco 71555 Radiator Coolant Hose - Upper

Dayco Curved Radiator Hose for Ford and Mercury

Dayco 71555 is a curved upper radiator coolant hose built for specific Ford and Mercury applications that require a dual I.D. hose profile. Made from EPDM and finished in black, it is shaped to route coolant cleanly through the engine bay while matching the original-style hose layout on listed vehicles.

The Dayco Curved Radiator Hose line focuses on application-specific cooling system replacement parts. For vehicles such as the Ford Mustang, Ford Thunderbird, Mercury Capri, and Mercury Cougar, this hose is sized to match the listed upper hose fitment and the dual inside diameters called out for the application.

Key Features

• Part number: 71555
• Brand line: Curved Radiator Hose
• Material: EPDM rubber
• Color: Black
• Dual I.D. hose design for the listed cooling system application
• End 1 inside diameter: 1 7/32 in.
• End 2 inside diameter: 1 5/16 in.
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Detailed Description

Dayco 71555 is a curved upper radiator hose for select Ford and Mercury vehicles from the 1980s and early 1990s. The EPDM construction is suited for coolant service, while the dual I.D. design supports the specific hose connection sizes used in the application. This hose is listed for upper radiator use on models including the Ford Mustang, Ford Thunderbird, Ford LTD, and Mercury Capri, along with additional Ford and Mercury passenger cars in the same platform family. If you are replacing a worn upper coolant hose on a Ford Mustang or Mercury Cougar, this part number provides a direct replacement path for the listed vehicles.

This part cross-references Duralast D71555 for the same application.

What It Helps Address

• Cracked or hardened upper radiator hose material
• Coolant seepage at the hose ends
• Incorrect hose routing on curved upper hose applications
• Soft spots, swelling, or collapse in the coolant hose
• Replacement needs for aging Ford and Mercury cooling system hoses

Installation Notes and Tips

• Verify the vehicle year, make, model, and upper hose routing before installation.
• Confirm the end diameters match the cooling system connection points: 1 7/32 in. and 1 5/16 in.
• Inspect hose clamps, thermostat housing, radiator necks, and adjacent fittings for wear before installing the new hose.
• Drain coolant to a safe level before removing the existing hose.
• After installation, refill and bleed the cooling system according to the vehicle service procedure.

Quality Assurance

Dayco 71555 is built to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator hose service. The EPDM construction and application-specific shape support consistent fitment on the listed Ford Mustang, Ford Thunderbird, Mercury Capri, and Mercury Cougar upper radiator hose applications.

• Fits 1985-1993 Ford Mustang, Upper
• Fits 1987-1988 Ford Thunderbird, Upper
• Fits 1985 Ford Thunderbird, Upper
• Fits 1985-1986 Ford LTD, Upper
• Fits 1986 Ford Thunderbird, Upper, Compatible with vehicles containing air conditioning.
• Fits 1983-1984 Ford Thunderbird, Upper, Compatible with vehicles containing air conditioning.
• Fits 1985-1986 Mercury Capri, Upper
• Fits 1986 Mercury Cougar, Upper, Compatible with vehicles containing air conditioning.
• Fits 1984 Mercury Cougar, Upper, Compatible with vehicles containing air conditioning.
• Fits 1985-1986 Mercury Marquis, Upper
• Fits 1985 Mercury Cougar, Upper
• Fits 1983-1984 Ford LTD, Upper, Compatible with vehicles containing air conditioning.
• Fits 1982-1984 Ford Mustang, Upper, Compatible with vehicles containing air conditioning.
• Fits 1982-1984 Mercury Capri, Upper, Compatible with vehicles containing air conditioning.
• Fits 1984 Mercury Capri, Upper, w/o A.C., w/o Top Tank Rad.
• Fits 1983-1984 Mercury Marquis, Upper, Compatible with vehicles containing air conditioning.
• Fits 1982-1983 Ford Fairmont, Upper, Compatible with vehicles containing air conditioning.
• Fits 1982-1983 Mercury Zephyr, Upper, Compatible with vehicles containing air conditioning.