Gates 21818 Radiator Coolant Hose - Heater To Water Pump

Gates 21818 Molded Coolant Hose for Ford Aerostar

The Gates 21818 molded coolant hose is built for a direct-fit coolant routing application on select Ford Aerostar models. It follows OEM-style geometry and integrates the branch configuration needed for the heater-to-water-pump path on equipped vehicles.

Key Features

• Fits 1986-1993 Ford Aerostar, heater to water pump
• Molded coolant hose with one branch for application-specific routing
• Constructed from EPDM and plastic for coolant system service
• OEM-style modular hose design with integrated components
• Centerline length: 50.25 in. (1276 mm)
• End 1 inside diameter: 16 mm (0.62 in.)
• End 2 inside diameter: 16 mm (0.62 in.)
• End 3 inside diameter: 1 in.

Product Details

Gates Molded Coolant Hose part number 21818 is part of the brand’s modular coolant hose line, which is built for specific vehicle applications and mirrors the layout of original equipment assemblies. This hose is shaped for the Ford Aerostar heater-to-water-pump route and includes the branch configuration required for proper coolant flow on vehicles with an auxiliary heater. Gates 21818 is a practical replacement when the original molded hose has aged, softened, cracked, or no longer holds its shape. This part cross-references Dayco 87761 for the same application.

Common Cooling System Issues It Can Address

• Coolant leaks from a cracked or deteriorated molded hose
• Restricted coolant circulation caused by hose collapse or deformation
• Improper hose routing after a failed original hose replacement
• Loss of heater performance related to damaged heater circuit plumbing
• Fitment problems on Ford Aerostar heater-to-water-pump hose routing

Installation Notes and Tips

Verify the vehicle year, engine layout, and auxiliary heater configuration before installation. Compare the original hose shape, branch location, and end diameters to the replacement part before removing the old hose. Inspect adjoining clamps, fittings, and coolant passages for wear or contamination, and refill the cooling system with the correct coolant mixture after installation.

Quality Assurance

Gates is a recognized aftermarket supplier of modular coolant hose assemblies, and this hose is manufactured to application-specific dimensions with OEM-style integrated design features. The molded construction and material selection are intended to support consistent fit and coolant system routing on the listed Ford Aerostar applications.