Gates 18321 HVAC Heater Hose - Radiator To Reservoir

Gates 18321 Molded Heater Hose Overview

The Gates 18321 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a formed routing path is required. It is made from EPDM and is approved for coolant, water, air, and marine applications.

Compatible with 2000-2003 Ford Focus radiator to reservoir routing, this molded heater hose follows the factory-style shape needed for a clean, secure fit. The Gates Molded Heater Hose line focuses on formed replacement hoses for modern vehicles with limited clearance.

Key Features

• Factory-molded, OE-style hose shape
• EPDM construction for coolant system service
• End I.D. measures 9 mm (.36 in) at both ends
• Centerline length: 544 mm (21.4 in)
• Designed for radiator to reservoir routing
• Approved for coolant, water, air, and marine use
• Part number: 18321

Detailed Product Description

Gates 18321 is a molded heater hose formed to match the routing demands of smaller, tighter engine bays. Its EPDM material and molded profile support consistent hose routing in coolant transfer applications, while the 9 mm inside diameter at both ends matches the listed Ford Focus fitment. This hose is a direct replacement choice for 2000-2003 Ford Focus radiator to reservoir service and is also referenced under cross-reference part numbers such as Continental 63503 and Dayco 87008 for the same application.

For buyers searching for a Ford Focus molded coolant hose, radiator to reservoir hose, or Gates 18321 heater hose replacement, this part provides the correct formed layout for the listed vehicle application. The Gates Molded Heater Hose product line is built around OEM-style shapes for vehicles where straight hose lengths do not follow the original routing.

Common Problems This Hose Can Address

• Cracked or hardened coolant hose material
• Leaks at a formed radiator-to-reservoir hose section
• Poor hose routing in a tight engine compartment
• Replacement needs after heat and age-related hose wear
• Loss of proper coolant transfer through the reservoir line

Installation Notes and Tips

Verify the hose routing against the original part before installation and confirm the 9 mm end size and 544 mm centerline length match the vehicle application. Inspect adjoining fittings and connection points for wear, scale, or residue before installing the new hose. For 2000-2003 Ford Focus radiator to reservoir service, route the hose to follow the factory molded shape so it sits correctly without twisting or kinking.

Quality Assurance

Gates is a recognized supplier of molded coolant hose solutions for OE-style replacement needs. Part number 18321 is built to the listed molded specification and application data for accurate fitment on the confirmed Ford Focus vehicles.