Dayco 71717 Radiator Coolant Hose - Upper

Curved radiator hose for cooling service

Dayco 71717 is a curved radiator coolant hose built for upper cooling-system routing on select trucks and utility vehicles. It uses EPDM construction and a single I.D. hose design to match the shape and connection size required for the application.

Key features

• EPDM rubber construction for coolant-system use
• Curved hose profile for upper radiator routing
• Single I.D. hose design with 1 5/16 in. ends
• Black finish for a clean OE-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Detailed description

This Dayco radiator coolant hose is engineered for direct replacement service where a curved upper hose is required. The 71717 part number is listed for 1994-1997 Chevrolet S10, 1994-1997 GMC Sonoma, 1996-1997 Isuzu Hombre, and 1994-1995 Chevrolet LLV applications. If you are replacing a worn Chevrolet S10 upper radiator hose or servicing a GMC Sonoma cooling system, this hose provides the correct curved layout and matching end diameter for the listed fitments. The 71717 part number also cross-references Duralast D71717 for the same application.

What it is used for

• Replacing a cracked or softened upper radiator hose
• Restoring coolant flow between engine and radiator
• Addressing leaks at hose ends or along the hose body
• Correcting hose routing when the original curved shape no longer holds

Installation notes and tips

Verify the hose routing, end diameter, and upper-position fitment before installation. Inspect the mating necks and clamps for corrosion or wear, and replace any damaged sealing surfaces before installing the new hose. Confirm the hose follows the original curved path without kinks or twist.

Quality assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for coolant-hose applications.