Dayco 70564 Engine Coolant Bypass Hose

Dayco 70564 Curved Radiator Hose

Dayco 70564 is a curved radiator hose built for engine coolant bypass service in select Nissan and Chevrolet applications. Made from EPDM rubber with a black finish, it provides a direct-fit cooling system hose solution for vehicles that need a 1-inch inside diameter at both ends.

This Dayco Curved Radiator Hose line is engineered for cooling-system routing where a formed hose shape is required to maintain proper coolant flow and fitment around engine components. The Dayco 70564 is specified to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for coolant hose applications.

Key Features

• EPDM construction for coolant hose service
• Black finish for OE-style appearance
• 1-inch inside diameter at both ends
• Single I.D. hose design
• Curved radiator hose profile for formed routing
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco 70564 part number for easy identification

Detailed Description

The Dayco 70564 engine coolant bypass hose is built for vehicles that require a curved radiator hose with matching 1-inch end diameters. Its EPDM material is selected for coolant-system use, while the formed shape helps maintain the routing needed in tight engine bays. This hose is listed for 1982-1983 Nissan 720 and 1967 Chevrolet C10 Suburban, C20 Suburban, K10 Suburban, and K20 Suburban applications. If you are sourcing a replacement hose for a Nissan 720 or classic Chevrolet Suburban cooling system, Dayco 70564 provides a direct reference point for fitment and interchange lookup.

This part cross-references Gates 20566 and ACDelco 20041S for the same application.

What It Helps Address

• Coolant leaks caused by cracked or aged rubber hose material
• Improper hose routing in curved radiator hose applications
• Cooling-system service needs on Nissan 720 and Chevrolet Suburban models
• Replacement of a worn engine coolant bypass hose with matching 1-inch ends
• Fitment lookup for Dayco 70564 cooling hose replacement

Installation Notes and Tips

Verify the hose path, end diameters, and formed shape before installation. Confirm that both connection points require a 1-inch inside diameter and compare the routing against the original hose on the vehicle. For best results, inspect adjoining clamps, necks, and coolant passages for wear or corrosion before installing the new hose.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for coolant hose applications. The EPDM construction and formed design support consistent fitment in the listed Nissan 720 and Chevrolet C10 Suburban, C20 Suburban, K10 Suburban, and K20 Suburban applications.