Gates 21943 Radiator Coolant Hose - Upper

Gates 21943 Molded Coolant Hose Overview

The Gates 21943 molded coolant hose is built for radiator coolant service with OEM-quality dimensions and EPDM construction. It is shaped for upper, lower, bypass, heater, and other coolant routing needs where a molded replacement is required.

For Ford F-150 and Ford Mustang cooling system repairs, this molded hose provides a direct replacement format that helps restore proper coolant flow without sourcing a dealer-only radiator hose. Gates 21943 is part of the Gates Molded Coolant Hose line, which covers a wide range of replacement cooling applications.

Key Features

• EPDM rubber construction for coolant system use
• Molded hose design for formed routing
• 2 in. inside diameter at both ends
• 15.5 in. centerline length
• No spring and no quick-connect fittings
• Direct replacement style for radiator coolant hose service

Product Details

Gates 21943 is a molded radiator coolant hose with a 2-inch end inside diameter on both ends and a 15.5-inch centerline length. The EPDM material is commonly used in engine cooling systems for its resistance to heat and coolant exposure. This hose is intended for applications that require a formed hose shape rather than a straight universal hose.

This part cross-references Dayco 71503 for the same application. If you are replacing a worn Ford F-150 or Ford Mustang coolant hose, Gates 21943 offers a molded replacement format that matches the routing needs of the original cooling system layout.

Common Problems This Hose Can Address

• Coolant leaks from a cracked or aged radiator hose
• Softening, swelling, or collapse of the original hose
• Poor coolant circulation caused by hose deterioration
• Loss of proper hose shape in a formed cooling line
• Need for a molded replacement during radiator service

Installation Notes and Tips

Inspect the mating necks, clamps, and nearby cooling components before installation. Drain coolant as needed, verify the hose routing matches the original formed path, and confirm the 2-inch connection points seat fully before refilling and bleeding the system. Check for leaks after the engine reaches operating temperature.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for radiator and heater circuit replacement work. The Gates Molded Coolant Hose line is engineered to cover a broad range of cooling system applications with formed-fit replacement options.