Dayco 70392 Radiator Coolant Hose - Upper

Dayco 70392 Curved Radiator Hose

Dayco 70392 is a curved radiator coolant hose built for upper radiator applications that require a 1 1/2 in. inside diameter at both ends. Made from EPDM and finished in black, this single I.D. hose is specified to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for common cooling-system service.

Use this Dayco Curved Radiator Hose line when you need a formed upper hose for classic Chevrolet, GMC, Buick, Oldsmobile, and Pontiac applications. The 70392 part number is listed across multiple OE and aftermarket cross-references, making it a practical replacement choice for restoration and maintenance work.

Key Features

• EPDM construction for radiator coolant service
• Curved upper radiator hose profile
• 1 1/2 in. inside diameter at both ends
• Single I.D. hose design
• Black finish for a clean OE-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Detailed Description

Dayco 70392 is a formed radiator coolant hose intended for upper hose routing where a curved shape is required. The EPDM rubber construction is suited for cooling-system temperatures and coolant exposure, while the matched 1 1/2 in. end diameters support a direct hose-to-fitting connection on listed applications. This part number is commonly referenced for older GM trucks and cars, including Chevrolet C10, C20, C30, Nova, El Camino, K10, K20, K5 Blazer, GMC C1500, C2500, C3500, K3500, Buick Skylark, Oldsmobile Omega, and Pontiac Phoenix.

This part cross-references Gates 20504 and NAPA 7297 for the same application. Dayco 70392 also appears in interchange listings with ACDelco, CARQUEST, Duralast, General Motors, Goodyear, Mopar, Motorcraft, Pirelli, and Uniroyal numbers.

What It Helps Address

• Cracked or hardened upper radiator hose material
• Coolant seepage at the hose body or ends
• Incorrect hose shape for curved upper routing
• Replacement needs during cooling-system service on classic GM vehicles
• Fitment issues caused by using a straight hose where a formed hose is required

Installation Notes and Tips

Verify the hose routing, end diameter, and upper radiator position before installation. Confirm whether the vehicle is equipped with air conditioning, since several listed applications are specific to A/C or non-A/C configurations. Inspect the radiator necks and engine fittings for corrosion or deformation before installing Dayco 70392, and replace clamps if the existing hardware shows wear.

For fitment, this hose is listed for upper radiator use on vehicles such as 1975-1979 Chevrolet Nova, upper; 1976 Chevrolet C10, upper; 1978-1979 GMC C1500, upper; and 1964-1965 Buick Skylark, upper. It is also listed for 1970-1974 Chevrolet and GMC truck and Suburban applications with the notes shown in the fitment data.

Quality Assurance

Dayco manufactures cooling-system hoses to published SAE specifications, and this hose is identified as an EPDM radiator coolant hose for upper applications. The 70392 part number is supported by broad interchange coverage across OE and aftermarket references.