Dayco 71951 Radiator Coolant Hose - Upper

Dayco 71951 Curved Radiator Hose Overview

Dayco 71951 is a curved radiator coolant hose built for upper cooling-system routing in select Buick and Pontiac applications. Made from EPDM rubber and formed as a single I.D. hose, it is sized with 1 1/4-inch inside diameters at both ends for a direct replacement-style fit.

Compatible With 1997-2005 Buick Park Avenue, upper; 2000-2005 Buick LeSabre, upper; and 2000-2005 Pontiac Bonneville, upper. This Dayco curved radiator hose supports the coolant path in vehicles that use a formed upper hose layout.

Key Features

• Dayco Curved Radiator Hose, part number 71951
• EPDM construction for cooling-system hose service
• Black finish for a factory-style appearance
• 1 1/4-inch inside diameter at both ends
• Single I.D. hose design for upper radiator routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Product Details

The Dayco 71951 radiator coolant hose is shaped for curved upper hose routing and is intended for vehicles that require a 1 1/4-inch hose connection at both ends. EPDM material is commonly used in coolant applications because it is suited to heat, ozone, and fluid exposure found in engine bay service. For buyers searching for a Dayco 71951 upper radiator hose for Buick LeSabre, Buick Park Avenue, or Pontiac Bonneville, this part provides a direct-match replacement format based on the listed fitment.

This part cross-references Gates 22328 and NAPA 8961 for the same application.

What It Helps Address

• Cracked or aged upper radiator hose material
• Coolant leaks at the hose body or connection points
• Softening, swelling, or collapse in the cooling hose
• Incorrect hose shape for curved upper routing
• Replacement needs for Buick LeSabre, Buick Park Avenue, and Pontiac Bonneville cooling systems

Installation Notes and Tips

Verify hose routing, end diameter, and upper-position fitment before installation. Inspect the radiator neck and engine-side connection surfaces for corrosion, residue, or damage that could affect sealing. Replace clamps if wear or distortion is present, and confirm the hose is seated fully before refilling and bleeding the cooling system.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent material and dimensional requirements for radiator coolant service.