Dayco 71939 Radiator Coolant Hose - Lower - Radiator To Thermostat

Dayco 71939 Curved Radiator Hose

Dayco 71939 is a branched radiator coolant hose built for the lower radiator-to-thermostat circuit on select Ford Taurus and Mercury Sable models. Made from EPDM rubber and finished in black, it follows the curved routing needed for a clean coolant connection in the engine bay.

This Dayco Curved Radiator Hose line focuses on OE-style routing and material selection for cooling-system service. The branched hose layout and SAE J20R4 Class D-1 / SAE J1684 Type EC specifications support a direct replacement approach for vehicles that need the correct formed hose shape and branch configuration.

Key Features

• EPDM construction for cooling-system use
• Black finish for a factory-style appearance
• Branched hose design with curved routing
• End 1 inside diameter: 1 15/32 in.
• End 2 inside diameter: 1 15/32 in.
• End 3 inside diameter: 23/32 in.
• Trunk height: 11 in.
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Detailed Description

Dayco 71939 radiator coolant hose is engineered for the lower radiator to thermostat connection on 1996-2000 Ford Taurus and 1996-2000 Mercury Sable applications. The formed, branched layout helps match the original hose path, which is important in tight engine compartments where hose angle and branch placement affect fitment and coolant flow routing. If you are searching for a 1996-2000 Ford Taurus lower radiator hose or a 1996-2000 Mercury Sable radiator-to-thermostat hose, this part number is the direct reference to check.

This part cross-references Ford F6DZ-8286-B and Motorcraft KM3031 for the same application.

What It Helps Address

• Cracked or aged lower radiator hose material
• Coolant leaks at the radiator-to-thermostat connection
• Incorrect hose routing after prior repairs
• Softening, swelling, or collapse in an old coolant hose
• Fitment issues caused by a missing branched hose shape

Installation Notes and Tips

Verify the hose routing against the original part before installation, especially the branch location and end diameters. Inspect the mating necks, clamps, thermostat housing, and radiator inlet for corrosion or damage before installing the new hose. Proper coolant refill and system bleeding are important after replacement to help restore normal cooling-system operation.

Quality Assurance

Dayco 71939 is built from EPDM and manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator coolant hose service. Confirm fitment by year, make, model, and lower radiator-to-thermostat position before ordering.