Gates 21851 Radiator Coolant Hose - Upper

Gates 21851 Molded Coolant Hose Overview

The Gates 21851 molded coolant hose is an OE-style radiator coolant hose built for upper cooling-system applications. It is formed to match the routing needed on select Subaru Impreza and Subaru Legacy models, helping restore proper coolant flow in the engine bay.

Made from EPDM rubber, this molded hose is shaped for a precise fit and consistent performance in radiator and heater hose service. Gates Molded Coolant Hose 21851 is a direct replacement choice for Subaru Impreza upper hose and Subaru Legacy upper hose applications.

Key Features

• EPDM construction for coolant-system durability
• Molded shape for proper routing in upper hose applications
• 1.5 in. inside diameter at both ends
• 259 mm centerline length for application-specific fitment
• No spring and no quick-connect fittings
• Fits upper radiator and HVAC-compatible coolant/heater hose applications on select Subaru models

Application Details

This Gates molded coolant hose is engineered for upper hose service on 1990-1999 Subaru Legacy, 1993-1999 Subaru Impreza, and 1999-2001 Subaru Impreza applications. The molded profile supports the factory hose path, which is important when replacing a worn or collapsed radiator hose on Subaru Impreza or Subaru Legacy cooling systems.

Part number 21851 is part of Gates’ Molded Coolant Hose line, a replacement hose family that covers upper, lower, bypass, heater, and other coolant routing needs with OEM-quality specifications. This part cross-references Dayco 71752 for the same application.

What This Hose Helps Address

• Cracked or aged upper radiator hose material
• Coolant leaks at the hose body from heat cycling
• Improper hose routing after a previous replacement
• Softening or collapse in a worn coolant hose
• Loss of coolant flow through the upper cooling circuit

Installation Notes

Verify the hose shape, end diameters, and centerline length against the original part before installation. Confirm the vehicle year, make, model, and upper-position routing for your Subaru Impreza or Subaru Legacy application. Inspect hose clamps, mating surfaces, and nearby cooling-system components before installing Gates 21851.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for radiator and heater hose replacement service. The Gates 21851 part number is supported by application-specific fitment data for select Subaru Impreza and Subaru Legacy models.