Gates 21103 Radiator Coolant Hose - Lower or Upper

Gates 21103 Molded Coolant Hose

Gates 21103 is a molded radiator coolant hose built for upper and lower cooling-system applications where an OE-style formed hose is required. Made from EPDM, it provides the shape and dimensions needed for direct replacement on select Ford, Mercury, Isuzu, and GM compact car applications.

The Gates Molded Coolant Hose line covers upper, lower, bypass, heater, and other coolant routing needs with OEM-quality specifications. For buyers searching for a molded coolant hose for a 1981-1986 Ford Escort upper hose or a 1984-1987 Isuzu Pickup lower radiator hose, this part number is a direct catalog match.

Key Features

• EPDM construction for coolant-system service
• Molded hose profile for formed routing and proper fit
• 1.25 in. (32 mm) end 1 inside diameter
• 1.5 in. (38 mm) end 2 inside diameter
• 15.7 in. (399 mm) centerline length
• No spring and no quick-connect fittings
• Fits upper and lower radiator hose applications listed in the catalog

Application Details

Gates 21103 is used in cooling-system service where a molded radiator coolant hose is needed to follow the factory hose path and maintain proper clearance around engine components. It is listed for 1981-1986 Ford Escort, upper; 1981-1986 Mercury Lynx, upper; 1982-1983 Mercury LN7, upper; 1984-1987 Isuzu Pickup, lower; 1984-1985 Isuzu Trooper, lower; and select 1982 GM compact models with a 25-inch wide radiator, lower. This part cross-references Dayco 71264 and 71299 for the same application.

What It Helps Address

• Cracked or split radiator hose sections
• Collapsed or softened coolant hose material
• Incorrect hose routing from universal cut-to-fit hose use
• Coolant leaks at worn hose connections
• Poor fitment on formed upper or lower hose runs

Installation Notes

Verify end diameters, centerline length, and hose routing before installation. Match the hose to the vehicle position shown in the catalog, since Gates 21103 is listed for both upper and lower applications depending on the vehicle. Inspect clamps, necks, and adjoining cooling-system components for wear before installing the new hose.

Quality Assurance

Gates Molded Coolant Hoses are produced to OEM-quality specifications for replacement cooling-system service. The Gates 21103 part number is cataloged for multiple vehicle applications and is supported by Gates’ broad molded hose replacement line.