Gates 21648 Radiator Coolant Hose - Upper

Gates 21648 Molded Coolant Hose

The Gates 21648 molded coolant hose is an OE-style radiator coolant hose built for upper cooling system applications. Made from EPDM and formed to the correct molded shape, it supports a direct replacement for select Chevrolet and GMC trucks from 1985-1987.

Key Features

• EPDM construction for coolant-system durability
• Molded hose profile for proper routing and fit
• 1.25 in. inside diameter at both ends
• 29.8 in. centerline length
• No spring and no quick-connect fittings
• Direct replacement for upper radiator coolant hose applications

Product Details

Gates Molded Coolant Hose line is built around OEM-quality specifications for upper, lower, bypass, heater, and other coolant routing needs. Part number 21648 is a molded radiator coolant hose with a 1.25-inch inside diameter on both ends and a 29.8-inch centerline length, making it a fitment-specific replacement for the cooling system layout used on select Chevrolet C10, K10, K20, R10, R20, and V10 models, as well as GMC C1500, C2500, K1500, K2500, R1500, R2500, and V1500 applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Vehicle Fitment

• Fits 1987 Chevrolet R10, Upper
• Fits 1987 Chevrolet R20, Upper
• Fits 1987 Chevrolet V10, Upper
• Fits 1987 GMC R1500, Upper
• Fits 1987 GMC R2500, Upper
• Fits 1987 GMC V1500, Upper
• Fits 1985-1986 Chevrolet C10, Upper
• Fits 1985-1986 Chevrolet C20, Upper
• Fits 1985-1986 Chevrolet K10, Upper
• Fits 1985-1986 GMC C1500, Upper
• Fits 1985-1986 GMC C2500, Upper
• Fits 1985-1986 GMC K1500, Upper
• Fits 1985 Chevrolet K20, Upper
• Fits 1985 GMC K2500, Upper

Common Replacement Uses

• Cracked or hardened upper radiator hose
• Coolant seepage at the hose body
• Incorrect hose routing from a previous replacement
• Heat-related hose swelling or softening
• Cooling system service on 1985-1987 Chevrolet and GMC trucks

Installation Notes

Verify hose routing, end diameters, and centerline length against the original part before installation. Inspect adjoining necks, clamps, and coolant passages for wear or corrosion, and confirm the hose is seated without twist or kinks. For best results, install on a cool engine and refill the cooling system according to the vehicle service procedure.

Quality Assurance

Gates molded coolant hoses are manufactured to OEM-quality specifications for replacement cooling system service. Part number 21648 is part of Gates' molded coolant hose line, which covers a wide range of radiator, heater, bypass, and other coolant applications.