Dayco 71639 Radiator Coolant Hose - Heater To Pipe or Lower - Tee To Radiator Cap

Overview of Dayco Curved Radiator Hose 71639

The Dayco Curved Radiator Hose 71639 is designed to provide reliable coolant flow for select Ford, Mazda, and Saturn vehicles. Engineered with durable EPDM material and a protective sleeve, this radiator coolant hose ensures consistent performance under typical engine operating conditions.

• Constructed from EPDM material for heat and chemical resistance
• Black color with a curved design for precise fitment
• 5/8 inch inside diameter on both ends for consistent coolant flow
• Includes a protective sleeve to guard against abrasion
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Single inside diameter hose type with 7-inch trunk height

Detailed Product Description

The Dayco Curved Radiator Hose 71639 is a single inside diameter hose constructed from EPDM, a synthetic rubber known for its resistance to heat, ozone, and coolant chemicals. This hose features a 5/8 inch inside diameter on both ends, making it suitable for consistent coolant flow in compatible vehicles. The black hose includes a protective sleeve that helps prevent wear from contact with engine components, although it does not contain a heat shield. Designed to meet SAE J20R4 Class D-1 and SAE J1684 Type EC standards, this hose complies with industry requirements for radiator coolant hoses.

The Curved Radiator Hose product line from Dayco focuses on delivering hoses shaped to fit specific engine layouts, reducing the need for modifications during installation. This hose’s curved design supports proper routing in the cooling system, which is critical for maintaining optimal engine temperature and preventing leaks.

Compatible Vehicles and Applications

• Ford models including Probe
• Mazda 626 and MX-6
• Saturn SC, SC1, SC2, SL, SL1, SL2, SW1, and SW2

This hose is intended for use in the radiator coolant system to replace worn or damaged hoses that may cause coolant leaks or overheating issues.

Common Issues Addressed by This Radiator Hose

• Coolant leaks due to cracked or brittle hoses
• Overheating caused by restricted coolant flow
• Hose abrasion from engine vibrations or contact
• Failure of original hoses not meeting SAE specifications
• Improper hose fitment leading to coolant system inefficiency

Installation Notes and Tips

Ensure the engine is cool before removing the old radiator hose to avoid burns. Inspect hose clamps and replace if corroded or damaged. Verify the hose routing matches the original to prevent kinks or interference with other engine components. The protective sleeve on this hose helps reduce abrasion, but care should be taken to avoid contact with sharp edges. Tighten clamps securely to prevent leaks but avoid overtightening which can damage the hose.

Quality Assurance and Warranty

Dayco manufactures the Curved Radiator Hose 71639 to meet SAE J20R4 Class D-1 and SAE J1684 Type EC standards, ensuring compliance with industry quality and performance benchmarks. While specific warranty details are not provided, Dayco products typically adhere to manufacturer quality controls to support reliable operation in compatible Ford, Mazda, and Saturn vehicles.