Dayco 70727 Radiator Coolant Hose - Lower

Dayco Curved Radiator Hose 70727

Dayco 70727 is a curved radiator coolant hose built for lower radiator routing on select Ford, Mercury, and Lincoln vehicles. Made from EPDM rubber and formed as a dual I.D. hose, it provides the correct transition between different hose diameters in applications that require a curved lower hose layout.

Use this Dayco Curved Radiator Hose line when you need a direct replacement for a lower coolant hose on classic full-size Ford and Mercury platforms, including Ford LTD, Mercury Marquis, and Mercury Grand Marquis applications. Part number 70727 is also cross-referenced to Gates 20707 for the same application.

Key Features

• EPDM construction for coolant-system service
• Black finish for OE-style appearance
• Dual I.D. hose design with 1 1/2 in. end 1 inside diameter and 2 in. end 2 inside diameter
• Curved radiator hose profile for lower hose routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco 70727 part number for catalog matching and replacement lookup

Detailed Description

Dayco 70727 is a radiator coolant hose designed for lower radiator connections where a curved shape and dual inside diameters are required. The EPDM rubber construction is suited for cooling-system temperatures and coolant exposure, while the formed profile helps match the routing used on many 1971-1978 Ford, Mercury, and Lincoln passenger cars. This hose is listed for vehicles such as Ford LTD, Mercury Marquis, Mercury Grand Marquis, Mercury Cougar, Mercury Montego, Ford Thunderbird, Ford Mustang, Mercury Colony Park, and Lincoln Continental.

For buyers searching by application, this hose is a direct match for lower radiator hose replacement on 1971-1978 Ford LTD, 1971-1978 Mercury Marquis, 1975-1978 Mercury Grand Marquis, and related classic Ford/Mercury cooling-system setups. The Dayco Curved Radiator Hose 70727 is also a useful reference when replacing an OE-style lower hose on vehicles with air conditioning or police package configurations where listed.

What It Helps Fix

• Cracked or hardened lower radiator hose rubber
• Coolant leaks at the lower hose connection
• Collapsed hose sections caused by age and heat cycling
• Incorrect hose routing on curved lower radiator applications
• Diameter mismatch between radiator and engine-side connections

Installation Notes and Tips

Verify end diameters before installation: 1 1/2 in. on one end and 2 in. on the other. Confirm the vehicle’s lower hose routing and application notes, especially for Ford LTD police package and non-police package variants, as well as Lincoln Continental models with air conditioning. Inspect clamps, radiator necks, and thermostat housing connections for corrosion or wear before installing the new hose.

For fitment lookup, this part fits 1971-1978 Ford LTD, lower; 1971-1978 Mercury Marquis, lower; 1975-1978 Mercury Grand Marquis, lower; and other listed Ford, Mercury, and Lincoln lower radiator hose applications. Part number 70727 should be matched to the vehicle’s exact year, model, and notes before purchase.

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 service. The EPDM construction and formed dual I.D. design reflect OE-style replacement needs for classic radiator hose applications.