Dayco 71839 Radiator Coolant Hose - Lower - Pipe To Radiator

Dayco Curved Radiator Hose 71839

Dayco 71839 is a curved radiator coolant hose built for lower pipe-to-radiator routing on select Ford and Mercury applications. Made from EPDM and finished in black, it uses a dual I.D. hose design to match the different connection sizes required by the vehicle cooling system.

Key Features

• EPDM construction for coolant-system service
• Black finish for a clean OE-style appearance
• Dual I.D. hose design with 1 1/16 in. and 1 1/4 in. inside diameters
• Curved radiator hose profile for lower pipe-to-radiator routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco Curved Radiator Hose line for direct-fit cooling system replacement needs

Application Details

Compatible with 1995-2000 Ford Contour, lower - pipe to radiator; 1995-2000 Mercury Mystique, lower - pipe to radiator; 1999 Mercury Cougar, lower - pipe to radiator, manufactured before 12/31/99; and 2000-2002 Mercury Cougar, lower - pipe to radiator. This part number, 71839, is also referenced in cooling system catalogs for the same application.

The Dayco Curved Radiator Hose product line focuses on formed hose routing and OE-style fitment for vehicles that require a shaped coolant hose rather than a straight universal hose. For Ford Contour and Mercury Mystique cooling system service, 71839 provides the correct curved profile and dual-size connection points needed at the lower radiator circuit.

What It Helps Address

• Cracked or split lower radiator hose sections
• Coolant leaks at the pipe-to-radiator connection
• Improper hose routing in the lower cooling circuit
• Softening, swelling, or deterioration of an aging EPDM hose
• Fitment issues caused by incorrect inside diameter sizing

Installation Notes

Verify the vehicle year, model, and lower hose routing before installation. Confirm the end diameters match the pipe and radiator connections, and inspect adjoining clamps, necks, and metal pipes for wear or corrosion before reassembly. This hose does not include a heat shield or protective sleeve.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and dimensional standards for cooling system replacement.