Dayco 70970 Radiator Coolant Hose - Lower

Dayco 70970 Curved Radiator Hose

Dayco 70970 is a curved radiator coolant hose built for lower radiator routing in a wide range of GM full-size and intermediate vehicles. Made from EPDM rubber and finished in black, it uses a dual I.D. design with 1 1/2 in. and 1 3/4 in. inside diameters to match the specified cooling system connection points.

This Dayco Curved Radiator Hose line is focused on direct-fit cooling system service for vehicles such as the Cadillac Brougham, Chevrolet Caprice, and Pontiac Bonneville. The 70970 hose follows SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator hose applications.

Key Features

• Brand: Dayco
• Part number: 70970
• Curved radiator coolant hose for lower radiator placement
• EPDM construction for cooling system service
• Black finish
• Dual I.D. hose with 1 1/2 in. and 1 3/4 in. inside diameters
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Detailed Description

Dayco 70970 is a lower radiator hose for vehicles that use a curved hose path between the engine and radiator. The EPDM rubber construction is suited for coolant exposure and temperature cycling, while the dual inside diameter layout supports the specified connection sizes at each end. This hose is listed for applications including 1977-1990 Buick LeSabre, 1980-1990 Chevrolet Caprice, 1977-1981 Pontiac Bonneville, and 1987-1992 Cadillac Brougham.

For buyers searching for a lower radiator hose for Cadillac Brougham, Chevrolet Caprice, or Pontiac Bonneville cooling system repair, Dayco 70970 provides a direct replacement option. This part cross-references Gates 21143 and ACDelco 24094L for the same application.

Common Problems This Hose Can Address

• Coolant leakage from a cracked or aged lower radiator hose
• Softening, swelling, or collapse of the original hose under heat
• Improper hose fit at the radiator or engine connection points
• Cooling system service on vehicles with a curved lower hose route
• Replacement of a worn hose during radiator or water pump maintenance

Installation Notes and Tips

Verify the end diameters before installation: 1 1/2 in. on one end and 1 3/4 in. on the other. Confirm the hose routing matches the lower radiator position and compare the existing hose shape to the curved profile of Dayco 70970 before removal. Inspect clamps, radiator necks, and adjoining coolant pipes for wear or corrosion during service.

Because this hose does not include a heat shield or protective sleeve, make sure surrounding components are positioned correctly and free from abrasion points. For fitment verification, use the vehicle listing for the exact year, make, model, and lower position shown in the application data.

Quality Assurance

Dayco manufactures cooling system hoses to published SAE specifications for radiator hose service. The 70970 is built to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for this application.