Dayco 71990 Radiator Coolant Hose - Lower

Overview of Dayco Curved Radiator Hose 71990

The Dayco Curved Radiator Hose 71990 is engineered for reliable coolant flow in select Cadillac, Chevrolet, GMC, and Saab vehicles. Designed with durable EPDM material and a protective sleeve, this radiator coolant hose supports efficient engine cooling under demanding conditions.

• Constructed from high-quality EPDM for heat and chemical resistance
• Black color with a protective sleeve for added durability
• Single inside diameter hose with 1 1/2 inch ends for consistent fitment
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Compatible with multiple GM and Saab models including Escalade, Silverado, Yukon, and 9-7x

Dayco Curved Radiator Hose Product Line Details

The Curved Radiator Hose line by Dayco focuses on precision-engineered radiator coolant hoses designed to match specific vehicle cooling system requirements. This product line emphasizes durability and fitment accuracy, featuring hoses that maintain coolant flow while resisting heat and pressure. The 71990 part exemplifies this with its curved design and protective sleeve, ensuring compatibility and longevity in demanding automotive environments.

Technical Description and Specifications

This radiator coolant hose is made from EPDM, a synthetic rubber known for its excellent resistance to heat, ozone, and coolant chemicals. Both ends have an inside diameter of 1 1/2 inches, making it a single i.d. hose suitable for precise coolant routing. The hose includes a protective sleeve to guard against abrasion and external damage, although it does not contain a heat shield. It complies with SAE J20R4 Class D-1 and SAE J1684 Type EC standards, ensuring it meets industry requirements for coolant hoses.

Compatible Vehicles and Applications

• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche, Avalanche 1500, Silverado 1500, Silverado 2500, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe, Trailblazer
• GMC Envoy, Sierra 1500, Sierra 2500, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500
• Saab 9-7x

Common Issues Addressed by Dayco Radiator Coolant Hose 71990

• Replacement of cracked or leaking radiator hoses
• Restoring proper coolant flow to prevent engine overheating
• Resolving hose abrasion or wear due to engine bay conditions
• Upgrading to a hose with protective sleeve for extended durability
• Ensuring correct fitment for specific GM and Saab models

Installation Notes and Tips

Before installation, ensure the engine is cool to avoid burns from hot coolant. Inspect hose connections and clamps for corrosion or damage and replace if necessary. Lubricate hose ends with a small amount of coolant or water to ease installation. Verify that the hose routing matches the original to prevent kinks or interference with other engine components. Tighten clamps securely but avoid over-tightening to prevent hose damage.

Quality Assurance and Warranty

Dayco radiator hoses are manufactured to meet SAE specifications, ensuring consistent quality and performance. The 71990 hose undergoes rigorous testing for heat resistance, pressure tolerance, and durability. While specific warranty details are not provided, Dayco products typically come with manufacturer-backed quality assurance to support reliable operation in automotive cooling systems.