Dayco 70775 Radiator Coolant Hose - Upper

Dayco Curved Radiator Hose 70775

Dayco 70775 is a curved radiator coolant hose built for upper cooling-system routing on select Buick, Oldsmobile, Pontiac, and related applications. Made from EPDM rubber with a black finish, it uses a single I.D. hose design with 1 1/2-inch inside diameter ends for a direct-fit style replacement.

The Dayco Curved Radiator Hose line focuses on formed coolant hoses that match the routing and shape needed in specific engine bays. This hose is specified to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator coolant service.

Key Features

• Part number 70775
• Curved radiator coolant hose for upper hose routing
• EPDM construction for coolant-system use
• Black finish
• 1 1/2-inch inside diameter at both ends
• Single I.D. hose design
• SAE J20R4 Class D-1 and SAE J1684 Type EC specification
• No heat shield and no protective sleeve

Fitment Details

• Fits 1979 Pontiac Bonneville, Upper
• Fits 1979 Pontiac Catalina, Upper
• Fits 1975-1977 Buick Century, Upper
• Fits 1975-1977 Buick LeSabre, Upper
• Fits 1975-1977 Buick Regal, Upper
• Fits 1975-1977 Buick Riviera, Upper
• Fits 1975-1976 Buick Skylark, Upper
• Fits 1975-1976 Oldsmobile Omega, Upper

This part cross-references General Motors 1247710 for the same application.

What It Helps Address

• Cracked or hardened upper radiator hose material
• Coolant leaks at the hose body
• Improper hose routing in the upper cooling circuit
• Soft spots, swelling, or collapse in an aging coolant hose
• Service replacement for a worn OE-style radiator hose

Installation Notes

Verify the 1 1/2-inch end diameters and upper-hose routing before installation. Inspect hose necks, clamps, and adjacent cooling-system components for wear, corrosion, or residue before placing the new hose in service. Confirm the hose follows the original curved path without twisting.

Quality Assurance

Dayco specifies this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for radiator coolant hose applications. The EPDM construction is selected for coolant-system service and the formed shape supports the listed upper-hose fitments, including Buick Century, Buick LeSabre, Buick Regal, Buick Riviera, Buick Skylark, Oldsmobile Omega, Pontiac Bonneville, and Pontiac Catalina applications.