Gates 21406 Radiator Coolant Hose - Upper

Gates 21406 Molded Coolant Hose Overview

The Gates 21406 molded coolant hose is an OEM-style radiator coolant hose built for upper cooling system service on select Chrysler, Dodge, and Plymouth vehicles. Made from EPDM, it is shaped to match the routing needed for specific applications, including Dodge D150, D250, Ramcharger, and Chrysler Fifth Avenue fitments.

Gates Molded Coolant Hose line is engineered to cover upper, lower, bypass, heater, and other coolant applications with OE-level specifications, helping reduce the time spent sourcing a dealer-only replacement. Part number 21406 is a direct-fit style solution for vehicles that require a molded upper radiator hose profile.

Key Features

• EPDM construction for coolant system service
• Molded hose design for proper routing and fit
• 1.5 in. inside diameter at both ends
• 23.3 in. centerline length
• No spring and no quick-connect fittings
• Fits upper radiator coolant hose applications
• Gates 21406 molded coolant hose for select Dodge, Chrysler, and Plymouth models

Detailed Product Description

This Gates radiator coolant hose is built for vehicles that need a molded upper hose with the correct shape and dimensions for the cooling system layout. The EPDM material is commonly used in coolant service because it handles heat and exposure associated with radiator and heater hose operation. With a 1.5-inch inside diameter on both ends and a 23.3-inch centerline length, the hose is sized for the listed applications rather than universal trimming.

Compatible vehicle coverage includes 1980-1992 Chrysler, Dodge, and Plymouth models such as Dodge D150, D250, D350, W150, W250, W350, Ramcharger, B150, B250, B350, Chrysler Fifth Avenue, Chrysler Imperial, and Plymouth PB150/PB250/PB350. This part cross-references Dayco 71167 and FEL-PRO 61156 for the same application. Gates 21406 is a practical replacement choice when the original upper radiator hose has aged, softened, or lost its molded shape.

Common Problems This Hose Can Address

• Coolant leaks from a cracked or hardened upper radiator hose
• Improper hose routing after an aging original hose collapses or deforms
• Cooling system service on Dodge D150, D250, Ramcharger, and related models
• Replacement of a worn molded hose that no longer matches the factory path
• Restoring a secure connection at the radiator hose ends

Installation Notes and Tips

• Verify the vehicle’s upper hose routing before installation, especially on applications noted as cut-to-fit.
• Inspect hose clamps, radiator necks, and thermostat housing surfaces for wear before installing the new hose.
• Drain coolant to a safe level before removing the old hose.
• Confirm the 1.5-inch end diameters and molded shape match the original part.
• After installation, refill the cooling system and check for leaks at operating temperature.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The Gates 21406 part number is part of a broad replacement hose line designed to support radiator and heater hose service across multiple vehicle platforms.