Dayco 70817 Radiator Coolant Hose

Dayco Curved Radiator Hose 70817

Dayco 70817 is a curved radiator coolant hose built from EPDM for dependable coolant routing in the engine bay. With 1 1/4-inch inside diameter ends and a black finish, it serves as a direct replacement for select Ford, Mercury, Suzuki, Chevrolet, Buick, Dodge, Oldsmobile, Plymouth, and Pontiac applications.

This Dayco Curved Radiator Hose line focuses on OE-style hose geometry and material selection for cooling-system service. The curved profile helps match factory routing on vehicles such as the Ford Taurus, Mercury Sable, and Suzuki Esteem, while meeting SAE J20R4 Class D-1 and SAE J1684 Type EC specifications.

• EPDM construction for cooling-system use
• Black finish for a factory-style appearance
• 1 1/4-inch inside diameter at both ends
• Single I.D. hose design
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC
• Curved radiator hose profile for routed coolant connections

Detailed Product Overview

The Dayco 70817 radiator coolant hose is engineered for vehicles that require a curved hose with matching 1 1/4-inch connections. It is listed for lower and upper cooling-system positions across multiple platforms, including 1997-1999 Ford Taurus upper pipe-to-engine applications, 2000 Ford Taurus lower pipe-to-engine applications, 2000 Mercury Sable lower pipe-to-engine applications, and 1999-2002 Suzuki Esteem lower applications. Additional coverage includes select Chevrolet Cavalier, Buick Skyhawk, Dodge Charger, Plymouth Turismo, Oldsmobile Firenza, Pontiac Sunbird, and Ford Fiesta applications.

This part cross-references Gates 20476 for the same application. The Dayco 70817 part number is also useful when searching for a curved radiator hose for Ford Taurus, Mercury Sable, or Suzuki Esteem cooling-system service.

Common Problems This Hose Can Address

• Cracked or hardened radiator hose material
• Coolant leaks at a worn hose connection
• Collapsed or softened hose sections from age and heat
• Incorrect hose routing after cooling-system repair
• Loss of proper coolant flow through the upper or lower hose path

Installation Notes and Tips

Verify hose routing, end diameter, and position before installation. Confirm whether the vehicle uses an upper, lower, pipe-to-engine, pipe-to-radiator, or water-pump-to-chain-case configuration, since the listed fitment varies by application. Inspect hose necks, clamps, and adjoining cooling-system components for wear before installing the new hose.

For best results, compare the removed hose to Dayco 70817 and confirm the curved shape matches the factory routing. This helps ensure proper clearance in tight engine compartments on vehicles such as the Ford Taurus, Mercury Sable, and Suzuki Esteem.

Quality Assurance

Dayco specifies EPDM construction and SAE J20R4 Class D-1 / SAE J1684 Type EC compliance for this hose, supporting consistent cooling-system service standards.

• Fits 1999-2002 Suzuki Esteem, lower
• Fits 2000 Ford Taurus, lower - pipe to engine
• Fits 2000 Mercury Sable, lower - pipe to engine
• Fits 1997-1999 Ford Taurus, upper - pipe to engine
• Fits 1997-1999 Mercury Sable, upper - pipe to engine
• Fits 1992-1994 Chevrolet Cavalier, lower
• Fits 1986 Buick Skyhawk, upper
• Fits 1982-1984 Buick Skyhawk, upper
• Fits 1983-1986 Dodge Charger, upper - water pump to chain case
• Fits 1983-1986 Oldsmobile Firenza, upper
• Fits 1983-1986 Plymouth Turismo, lower - water pump to chain case
• Fits 1984-1986 Plymouth Turismo, upper - water pump to chain case
• Fits 1986 Pontiac Sunbird, upper
• Fits 1984-1985 Buick Skyhawk, upper
• Fits 1984-1985 Pontiac J2000 Sunbird, upper
• Fits 1984 Buick Skyhawk, upper - pipe to engine
• Fits 1982-1983 Pontiac J2000, upper
• Fits 1978-1980 Ford Fiesta, lower - pipe to radiator