Dayco 70956 Radiator Coolant Hose - Upper

Dayco 70956 Curved Radiator Hose

Dayco 70956 is a curved radiator coolant hose built for upper cooling-system routing on select GM full-size cars. It uses EPDM construction and a 1 1/2-inch inside diameter at both ends for a direct replacement on the listed applications.

Compatible with 1977-1979 Chevrolet Caprice upper radiator hose applications, 1977-1979 Chevrolet Impala upper radiator hose applications, and other listed GM models, this Dayco Curved Radiator Hose is shaped to follow the factory hose path. The Dayco 70956 part number is also referenced in common aftermarket catalogs for the same application.

Key Features

• EPDM rubber construction for cooling-system service
• Black finish for a factory-style appearance
• 1 1/2-inch inside diameter at both ends
• Single I.D. hose design
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved radiator hose profile for upper hose routing

Product Details

Dayco’s Curved Radiator Hose line focuses on replacement hoses shaped for specific engine bay routing, helping maintain proper coolant flow and a clean factory-style fit. This radiator coolant hose is intended for upper hose locations on select 1977-1979 Chevrolet Caprice and Impala models, plus 1978 Buick LeSabre, 1977 Oldsmobile Custom Cruiser, 1977 Oldsmobile Delta 88, 1977 Pontiac Laurentian, and 1977 Pontiac Parisienne. The Dayco 70956 is a direct-fit style replacement for vehicles that require a curved upper hose with matching 1 1/2-inch ends.

This part cross-references ACDelco 26084X and Gates 21283 for the same application.

What This Hose Helps Address

• Cracked or hardened upper radiator hose material
• Coolant leaks at the hose body or connection points
• Improper hose routing caused by a worn or misshaped hose
• Restricted cooling-system service due to an aging replacement hose
• Loss of factory-style fit on listed Chevrolet, Buick, Oldsmobile, and Pontiac applications

Installation Notes and Tips

Verify the hose path, end diameters, and upper radiator location before installation. Inspect the radiator neck and engine-side connection for corrosion, residue, or damage, and replace clamps if they no longer secure the hose properly. Confirm clearance around nearby belts, pulleys, and fan components so the curved hose follows the original routing without twisting.

Quality Assurance

This Dayco radiator coolant hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for cooling-system hose applications.