Dayco 72991 Radiator Coolant Hose - Lower

Overview of Dayco Curved Radiator Hose 72991

The Dayco Curved Radiator Hose 72991 is engineered for reliable coolant flow in select Infiniti models. Designed with durable EPDM material, this black radiator coolant hose ensures consistent performance under typical engine operating conditions.

• Constructed from EPDM for heat and chemical resistance
• Black color with a curved design for precise fitment
• Inside diameter of 1 5/16 inches on both ends
• Outside diameter of 1 3/4 inches on both ends
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Single inside diameter hose without heat shield or protective sleeve
• Trunk height dimension of 19 inches

Detailed Product Description

This Dayco Curved Radiator Hose 72991 is specifically designed to maintain optimal coolant circulation in Infiniti FX35, FX37, M35h, M37, Q70, Q70L, and QX70 vehicles. The hose is made from EPDM (ethylene propylene diene monomer), a synthetic rubber known for its resistance to heat, ozone, and coolant chemicals, which helps extend the hose's service life. Both ends of the hose have an inside diameter of 1 5/16 inches and an outside diameter of 1 3/4 inches, ensuring a secure and leak-free connection to the radiator and engine fittings. This single inside diameter hose complies with SAE J20R4 Class D-1 and SAE J1684 Type EC standards, confirming its suitability for automotive coolant systems.

About the Curved Radiator Hose Product Line

The Dayco Curved Radiator Hose line focuses on providing hoses with precise bends and dimensions to fit specific vehicle cooling systems. This product line is designed to replace original equipment hoses that require a curved shape for proper routing and clearance within the engine bay. The 72991 part number is part of this line, offering a tailored fit for various Infiniti models to maintain efficient coolant flow and system integrity.

Common Applications and Problem Solving

• Replacement for cracked or leaking radiator coolant hoses
• Restores proper coolant flow in Infiniti FX35, FX37, M35h, M37, Q70, Q70L, and QX70
• Prevents overheating caused by compromised hoses
• Addresses hose swelling or softening due to age or heat exposure
• Ensures compatibility with factory cooling system specifications

Installation Notes and Tips

When installing the Dayco Curved Radiator Hose 72991, ensure the engine is cool to avoid burns from hot coolant. Verify that the hose dimensions match the original equipment to prevent leaks. Use appropriate clamps to secure both ends of the hose firmly. Inspect adjacent components for wear or damage during installation to maintain overall cooling system health.

Quality Assurance and Warranty

Dayco manufactures the Curved Radiator Hose 72991 to meet SAE specifications, ensuring compliance with industry standards for durability and performance. While specific warranty details are not provided, Dayco products typically undergo rigorous quality control to support reliable operation in automotive cooling systems.