Dayco 71558 Radiator Coolant Hose - Upper

Dayco 71558 Curved Radiator Hose

Dayco 71558 is a curved upper radiator coolant hose built for select Chevrolet, GMC, and Pontiac applications. It uses EPDM construction and a dual I.D. design to match the listed cooling-system connections on compatible vehicles.

Key Features

• EPDM rubber construction for radiator coolant service
• Black finish
• Dual I.D. hose with 1 1/4 in. end 1 inside diameter and 1 1/2 in. end 2 inside diameter
• Upper curved radiator hose layout
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco Curved Radiator Hose line for direct-fit cooling system replacement

Product Details

This Dayco curved radiator hose is intended for upper hose routing on a wide range of GM trucks, SUVs, and cars, including Chevrolet C10, K10, Blazer, GMC Jimmy, and Pontiac Grand Prix applications. The dual inside diameter design supports the listed hose connection sizes, while the EPDM material is selected for coolant-system use and resistance to heat and aging in normal service.

This part cross-references ACDelco 26064X and Gates 21204 for the same application. Dayco 71558 is a practical replacement choice when servicing an upper radiator hose on vehicles such as the Chevrolet C20, GMC C2500, or Chevrolet R3500.

What It Helps Address

• Cracked or split upper radiator hose
• Coolant leaks at the hose connection points
• Softening, swelling, or deterioration from age and heat
• Restricted coolant flow caused by hose collapse
• Incorrect hose fitment on dual-diameter upper hose applications

Installation Notes and Tips

Verify the vehicle’s year, make, model, and upper-hose routing before installation. This hose is listed for specific applications, including some vehicles without air conditioning, so confirm the notes in the fitment data before ordering. Inspect the radiator neck, thermostat housing, clamps, and adjacent cooling components for wear or corrosion before replacing the hose.

Compatible fitment includes 1980-1986 Chevrolet C10, 1980-1986 Chevrolet K10, 1980-1986 GMC C1500, 1980-1986 GMC K1500, 1987-1988 Chevrolet Blazer, 1987-1988 GMC Jimmy, 1989-1991 Chevrolet R3500, and 1987-1991 GMC V3500. Dayco 71558 also appears in upper radiator hose applications for Chevrolet R20, GMC C2500, and Pontiac Grand Prix models listed in the fitment data.

Quality Assurance

Dayco designs this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator coolant service. The Curved Radiator Hose product line is built for direct replacement use in listed GM cooling-system applications.