Gates 21825 Radiator Coolant Hose - Upper

Gates 21825 Molded Coolant Hose

The Gates Molded Coolant Hose 21825 is a molded radiator coolant hose built to OEM-quality specifications for upper coolant routing. It is formed from EPDM for dependable coolant-system service and is shaped to match the original hose path on select Chevrolet and GMC medium-duty applications.

For buyers searching for a replacement radiator hose for Chevrolet P20, Chevrolet P30, GMC P2500, or GMC P3500, this Gates 21825 hose provides the correct molded profile for upper-position cooling-system service. It is part of the Gates Molded Coolant Hose line, which covers upper, lower, bypass, heater, and other coolant hose applications.

Key Features

• Brand: Gates Molded Coolant Hose
• Part number: 21825
• Part type: radiator coolant hose
• EPDM construction for coolant-system durability
• Molded design for a precise hose route
• 1.75 in. inside diameter at both ends
• 31.3 in. centerline length
• No spring and no quick-connect fittings
• Upper hose position

Product Details

Gates 21825 is a molded upper radiator coolant hose engineered for direct replacement use on select Chevrolet and GMC chassis applications. The hose measures 1.75 inches inside diameter at each end and 31.3 inches centerline length, with an EPDM rubber construction that is commonly used in cooling-system service for heat and coolant resistance. This molded hose follows the original routing needed for proper fitment on the listed vehicles, including Chevrolet P20 and P30 and GMC P2500 and P3500 models.

This part cross-references Bosch 8515 and Dayco 71551 for the same application.

What It Helps Address

• Cracked or deteriorated upper radiator hose
• Coolant leaks at the hose body or connection points
• Incorrect hose routing after prior replacement
• Restricted cooling-system flow caused by a damaged hose
• Service downtime on Chevrolet P30 and GMC P3500 cooling repairs

Installation Notes and Tips

Verify the hose shape, end diameters, and centerline length against the removed part before installation. Confirm upper-position routing and check surrounding clamps, necks, and adjacent cooling-system components for wear or corrosion before reassembly. This hose is listed for 1984-1995 Chevrolet P30 upper, 1984-1989 Chevrolet P20 upper, 1984-1995 GMC P3500 upper, and 1984-1989 GMC P2500 upper, excluding motor home applications where noted.

Quality Assurance

Gates manufactures molded coolant hoses to OEM-quality specifications and offers a broad replacement line for coolant-system service. Part number 21825 is built for direct-fit replacement on the listed Chevrolet and GMC applications.