Gates 25250 Radiator Coolant Hose

Flexible coolant hose for OE-style replacement

The Gates Vulco-Flex II radiator coolant hose is built for applications that need a flexible, durable replacement with a precise sealing surface. Part number 25250 is designed to follow the angles and planes of many OE coolant hose layouts, making it a practical choice for service on older Toyota Corolla, Toyota Pickup, and Chevrolet S10 cooling systems.

Key features

• Flexible coolant hose construction for routing in multiple directions
• EPDM and steel materials for durability in cooling system service
• Improved sealing surface for stronger leak resistance at the connection points
• 1.25 in. inside diameter at both ends for matched hose connections
• 9.5 in. centerline length for compact upper and lower radiator hose applications
• Non-molded design for replacement of select OE hose shapes

Product details

Gates Flexible Coolant Hose (Standard), part number 25250, is intended for radiator coolant hose replacement where a formed hose is not required. The flexible design helps replicate the bends and offsets found in many factory coolant hose routes, while the EPDM and steel construction supports dependable use in the engine cooling circuit. This hose is a direct-fit style solution for select upper and lower radiator hose positions across a wide range of vehicles, including Toyota Corolla, Toyota Pickup, and Chevrolet S10 applications.

This part cross-references Dayco 81021 and Hayden 5010 for the same application.

Used to address cooling system issues

• Cracked or aged radiator coolant hose material
• Leaks at hose-to-pipe or hose-to-radiator connections
• Incorrect hose routing after OE hose replacement
• Need for a flexible replacement where molded hose shapes are unavailable
• Service on upper or lower coolant hose positions with a 1.25 in. connection size

Installation notes and tips

Verify the end inside diameter and centerline length before installation. Confirm the hose route, position, and clearance around belts, pulleys, and nearby components. This hose is listed for upper, lower, upper - pipe to radiator, lower - pipe to radiator, and upper - engine to pipe positions depending on vehicle application. For fitment examples, it fits 1985-1992 Toyota Corolla, upper; 1979-1983 Toyota Pickup, lower - pipe to radiator; and 1983-1985 Chevrolet S10, lower - pipe to radiator.

Quality assurance

Gates manufactures this coolant hose as part of its Flexible Coolant Hose (Standard) line, engineered for replacement service where a flexible OE-style routing solution is needed. Part number 25250 is built to support leak-resistant sealing and consistent fitment across listed applications.