Dayco 70965 Radiator Coolant Hose - Upper

Dayco 70965 Curved Radiator Hose

Dayco 70965 is a curved radiator coolant hose built for upper cooling-system routing on select Ford, Lincoln, and Mercury applications. This dual I.D. hose uses EPDM construction, a protective sleeve, and SAE J20R4 Class D-1 / SAE J1684 Type EC compliance to support reliable coolant transfer in demanding engine bay conditions.

The Dayco Curved Radiator Hose line focuses on application-specific hose geometry and OE-style fitment. For vehicles such as the Ford Mustang, Mercury Capri, and Lincoln Mark VII, the curved profile helps match the original routing path while maintaining proper coolant flow and hose alignment.

• EPDM rubber construction for cooling-system service
• Dual I.D. hose with 1 1/4 in. end 1 inside diameter and 1 1/2 in. end 2 inside diameter
• Black finish with protective sleeve
• Upper radiator hose position
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved hose shape for application-specific routing

This radiator coolant hose is used in upper radiator connections where the original hose follows a curved path between the engine and radiator. It cross-references Gates 21159 for the same application. Part number 70965 is listed for select 1979-1993 Ford Mustang, 1985-1992 Lincoln Mark VII, 1986-1988 Ford Thunderbird, 1986-1988 Mercury Cougar, 1985-1987 Lincoln Continental, 1979-1986 Mercury Capri, and 1984-1985 Ford LTD upper hose applications.

Fitment Details

• Fits 1979-1993 Ford Mustang, Upper, Curved Radiator Hose
• Fits 1985-1992 Lincoln Mark VII, Upper, Curved Radiator Hose
• Fits 1986-1988 Ford Thunderbird, Upper, Curved Radiator Hose
• Fits 1986-1988 Mercury Cougar, Upper, Curved Radiator Hose
• Fits 1985-1987 Lincoln Continental, Upper, Curved Radiator Hose
• Fits 1979-1986 Mercury Capri, Upper, Curved Radiator Hose
• Fits 1984-1985 Ford LTD, Upper, Curved Radiator Hose

Installation Notes and Tips

Verify the upper hose routing, end diameters, and clearance around nearby components before installation. Inspect hose necks, clamps, and mating surfaces for corrosion or damage, and confirm the hose follows the original curved path without twisting. Use the vehicle’s cooling-system service procedure when replacing the hose and refill with the correct coolant mixture after installation.

Quality Assurance

Dayco manufactures this hose to meet published SAE cooling-system specifications and application-specific dimensional requirements. The EPDM material and protective sleeve support durability in standard engine bay heat exposure, while the curved design helps maintain OE-style routing on the listed Ford, Lincoln, and Mercury vehicles.