Dayco 70566 Radiator Coolant Hose - Upper

Dayco 70566 Curved Radiator Hose Overview

Dayco 70566 is a curved radiator coolant hose built for engine cooling system service where a 1-inch inside diameter is required at both ends. Made from EPDM rubber in black, this single I.D. hose follows the Dayco Curved Radiator Hose line for routing coolant between engine and radiator connections in a clean, OE-style layout.

For drivers searching for a radiator coolant hose for Chevrolet, GMC, or other GM applications, this hose is a direct-fit style replacement when the vehicle calls for the listed dimensions and SAE specifications. The Dayco 70566 part number is also commonly searched as a replacement for cross-reference numbers such as Gates 20565 and ACDelco 20040S.

Key Features

• EPDM construction for coolant-system use
• Black finish for a factory-style appearance
• 1-inch inside diameter at both ends
• Single I.D. hose design for straightforward routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved radiator hose profile for applications with shaped hose routing

Dayco Curved Radiator Hose Line

The Dayco Curved Radiator Hose line is built for cooling system service where molded routing and consistent hose sizing matter. Part number 70566 follows that product line approach with EPDM material and SAE-rated construction, making it a practical choice for radiator hose replacement on vehicles that require a curved 1-inch hose. If you are sourcing a Dayco radiator hose for Chevrolet or GMC cooling system repair, this part number is one to verify against the original hose dimensions.

Detailed Description

Dayco 70566 is a radiator coolant hose intended for engine cooling circuits that use a curved hose path and 1-inch connections. The EPDM rubber construction is suited to coolant exposure and underhood temperature cycling, while the SAE J20R4 Class D-1 and SAE J1684 Type EC ratings provide a clear specification reference for parts matching. This hose does not include a heat shield or protective sleeve, so it is best matched to applications where the original hose routing does not require added shielding. Search terms such as Dayco 70566 radiator hose, curved coolant hose, and 1-inch radiator hose are commonly used when identifying this part for Chevrolet and GMC service work.

What It Helps Address

• Cracked or aged radiator hose material
• Coolant leaks at a worn hose connection
• Incorrect hose routing from a damaged curved hose
• Cooling system service on vehicles needing a 1-inch I.D. hose
• Replacement of an OE-style hose with matching SAE specifications

Installation Notes and Tips

Verify the hose shape, end diameters, and routing path against the removed part before installation. Confirm that the application calls for a 1-inch inside diameter at both ends and that the curved profile matches the original routing. Inspect hose clamps, necks, and adjoining cooling system components for wear or corrosion before installing the new hose. This part cross-references Gates 20565 and ACDelco 20040S for the same application.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC standards, giving buyers a specification-based reference for cooling system replacement. The EPDM construction and molded curved design support consistent fitment where the original hose follows a shaped path.