Dayco 71390 Engine Coolant Bypass Hose

Overview of Dayco Curved Radiator Hose 71390

The Dayco Curved Radiator Hose 71390 is engineered for reliable engine coolant bypass in select Chevrolet and GMC models. Designed with durable EPDM material, this black dual inside diameter hose ensures efficient coolant flow and heat resistance for vehicles like the Chevrolet S10 and GMC Sonoma.

• Constructed from durable EPDM material for heat and chemical resistance
• Dual inside diameter hose with 11/16 inch and 5/8 inch ends
• Complies with SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Black color for standard OEM appearance
• Trunk height of 12 1/4 inches for precise fitment

Detailed Product Description

The Dayco Curved Radiator Hose 71390 is a specialized engine coolant bypass hose designed to meet the cooling system demands of Chevrolet and GMC trucks and SUVs, including the S10, S10 Blazer, S15, S15 Jimmy, and Sonoma models. Made from EPDM, a synthetic rubber known for its excellent resistance to heat, ozone, and coolant chemicals, this hose maintains integrity under high-temperature conditions. The dual inside diameter design features an 11/16 inch opening on one end and a 5/8 inch opening on the other, allowing for a secure and leak-free connection within the cooling system.

This hose meets SAE J20R4 Class D-1 and SAE J1684 Type EC standards, ensuring it adheres to industry requirements for coolant hoses. The 12 1/4 inch trunk height dimension supports proper routing and fitment in the engine bay, reducing the risk of kinks or interference with other components.

About the Curved Radiator Hose Product Line

Dayco's Curved Radiator Hose line focuses on providing hoses with precise bends and dual inside diameters to accommodate specific engine coolant bypass applications. This product line is designed to replace OEM hoses with exact fit and material specifications, ensuring compatibility and durability in demanding automotive environments.

Common Applications and Problem Solving

• Replacement for cracked or leaking engine coolant bypass hoses in Chevrolet S10 and GMC Sonoma
• Prevents coolant leaks caused by hose degradation or swelling
• Maintains proper coolant flow to avoid engine overheating
• Addresses fitment issues with hoses that have mismatched diameters
• Restores cooling system integrity after damage from heat or chemical exposure

Installation Notes and Tips

Ensure the engine is cool before removing the old hose to prevent burns. Verify the hose ends match the 11/16 inch and 5/8 inch inside diameters for proper fit. Inspect hose clamps and replace if worn to secure the hose firmly. Route the hose carefully to avoid contact with moving parts or sharp edges that could cause premature wear.

Quality Assurance

Dayco manufactures the Curved Radiator Hose 71390 to meet SAE specifications, providing assurance of material quality and dimensional accuracy. While specific warranty details are not provided, Dayco products typically adhere to industry standards for durability and performance in automotive cooling systems.