Gates 21770 Radiator Coolant Hose - Upper

Gates 21770 Molded Coolant Hose Overview

The Gates 21770 molded coolant hose is an OE-style radiator coolant hose built for upper cooling system routing on select Chevrolet and GMC trucks and SUVs. Made from EPDM, it is shaped to match the factory hose path for a direct replacement on listed applications.

Compatible with 1988-1995 Chevrolet C1500, C2500, C3500, K1500, K2500, and K3500 upper hose applications, as well as select GMC C1500, C2500, C3500, K1500, K2500, K3500, Yukon, and Chevrolet Tahoe and Blazer models.

Key Features

• Gates Molded Coolant Hose line
• Part number 21770
• EPDM construction for coolant-system service
• Molded shape for upper radiator hose routing
• 1.81 in. inside diameter at both ends
• 24.6 in. centerline length
• No spring included
• No quick-connect fittings

Product Details

Gates 21770 is a molded radiator coolant hose engineered for upper hose replacement where the factory routing requires a formed hose rather than a straight universal length. The EPDM material is selected for coolant exposure and underhood temperature conditions, while the molded profile helps match the original hose path on the vehicle. This part number is used across multiple Chevrolet and GMC light-duty truck and SUV applications, including Chevrolet C1500 and GMC K1500 upper hose service.

The Gates molded coolant hose line is built around OEM-quality specifications for radiator, heater, bypass, and other coolant-system applications. If you are replacing a worn upper hose on a Chevrolet Tahoe, GMC Yukon, or a C/K-series truck, Gates 21770 provides a direct-fit replacement option for the listed vehicles.

This part cross-references Dayco 71476 and Continental 61530 for the same application.

What It Helps Fix

• Coolant leaks from a cracked or softened upper radiator hose
• Collapsed or misshaped hose routing after heat cycling
• Restricted coolant flow caused by hose deterioration
• Maintenance issues on aging Chevrolet and GMC cooling systems
• Replacement needs for a formed upper hose on listed truck and SUV applications

Installation Notes

Verify the hose routing, end diameters, and centerline length before installation. This molded hose is listed for upper position use only, so confirm the original hose location on the vehicle before ordering. Inspect adjoining clamps, necks, and coolant passages for wear or corrosion during replacement, and refill the cooling system with the correct coolant after installation.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The molded design and EPDM construction support accurate fitment and dependable service in radiator hose replacement work.