Gates 21519 Radiator Coolant Hose - Upper

Gates 21519 Molded Coolant Hose Overview

The Gates 21519 molded coolant hose is an OEM-style radiator coolant hose built for upper cooling-system routing on select Chevrolet and GMC applications. Made from EPDM, it follows molded dimensions for a direct replacement on vehicles that need a formed hose shape rather than a universal cut-to-fit hose.

Compatible with 1985-1989 Chevrolet P30 and 1985-1989 GMC P3500 upper coolant hose applications, this part supports radiator hose replacement on motor home and chassis-mounted configurations. Gates 21519 is part of the Molded Coolant Hose line, which covers upper, lower, bypass, heater, and other coolant routing needs.

Key Features

• EPDM construction for coolant-system service
• Molded hose profile for formed routing
• End 1 inside diameter: 1.25 in. (32 mm)
• End 2 inside diameter: 1.5 in. (38 mm)
• Centerline length: 35.7 in. (907 mm)
• No spring and no quick-connect fittings
• Upper hose position for listed Chevrolet and GMC fitments

Product Details

Gates Molded Coolant Hose part number 21519 is engineered to match OEM-style coolant hose geometry for the listed vehicles, helping maintain proper hose routing in the engine bay. The molded shape is important where a straight hose would not follow the original path cleanly, especially on upper radiator hose applications for Chevrolet P30 and GMC P3500 motor home and chassis-mounted setups. If you are replacing a worn upper radiator hose on a 1985-1989 Chevrolet P30 or 1985-1989 GMC P3500, this Gates 21519 hose provides the correct formed layout for the application.

This part cross-references Dayco 71429 for the same application.

What This Hose Helps Address

• Cracked or hardened upper radiator hose material
• Coolant leaks at a worn hose body
• Incorrect hose routing from a non-molded replacement
• Heat-related hose collapse in aging cooling systems
• Fitment issues on upper hose replacements for Chevrolet P30 and GMC P3500

Installation Notes and Tips

Verify the hose position, end diameters, and centerline length before installation. Compare the original hose routing on the vehicle to the molded shape of Gates 21519, especially on 1985-1989 Chevrolet P30 and 1985-1989 GMC P3500 upper radiator hose applications. Inspect adjoining clamps, necks, and coolant passages for wear or corrosion before installing the new hose.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for radiator and coolant-system replacement use. The Molded Coolant Hose line is built to cover a broad range of cooling applications with formed hose construction and application-specific dimensions.