Dayco 71310 Radiator Coolant Hose - Lower

Dayco 71310 Curved Radiator Hose Overview

Dayco 71310 is a curved radiator coolant hose built for lower cooling-system routing where a formed EPDM hose is required. It measures 1 1/2 in. inside diameter at both ends and follows a single I.D. hose design for direct coolant transfer in the lower radiator circuit.

Compatible with select Buick and Oldsmobile applications, including Buick Riviera, Buick Century, Buick Reatta, Buick LeSabre, Oldsmobile Toronado, Oldsmobile Cutlass Ciera, and Oldsmobile Cutlass Cruiser, this hose supports OE-style replacement needs for vehicles using a curved lower radiator hose layout.

Key Features

• EPDM construction for coolant-system service
• Black curved radiator hose profile
• 1 1/2 in. inside diameter at both ends
• Single I.D. hose design
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Lower hose application for select Buick and Oldsmobile models

Product Details

The Dayco Curved Radiator Hose line is built for formed coolant routing where a straight hose will not follow the factory path. Dayco 71310 uses EPDM rubber for resistance to heat and coolant exposure, and its curved shape helps maintain proper routing in lower radiator hose applications. This part cross-references ACDelco (e.g., 22223M, 22266M) for the same application.

Fits 1986-1993 Buick Riviera, lower; Fits 1986-1991 Buick Century, lower; Fits 1988-1991 Buick Reatta, lower; Fits 1988 Buick LeSabre, lower; Fits 1986-1992 Oldsmobile Toronado, lower; Fits 1986-1991 Oldsmobile Cutlass Ciera, lower; Fits 1987-1991 Oldsmobile Cutlass Cruiser, lower. Dayco 71310 is a direct-fit style lower radiator coolant hose for these listed vehicles.

Common Replacement Reasons

• Cracked or hardened lower radiator hose
• Coolant seepage at the hose body
• Softening, swelling, or collapse under heat
• Incorrect routing from a previous replacement hose
• Loss of cooling-system flow due to hose deterioration

Installation Notes

Verify end diameters, hose routing, and vehicle application before installation. Inspect hose clamps, radiator necks, and engine fittings for wear or corrosion before transferring the new hose into place. Confirm the hose follows the original curved path without kinks, twists, or contact with moving or hot components.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator coolant hose service. The EPDM construction and formed profile support consistent fitment in the listed Buick and Oldsmobile lower hose applications.