Gates 25251 Radiator Coolant Hose

Flexible coolant hose for OE-style routing

The Gates 25251 Vulco-Flex II is a flexible radiator coolant hose built for direct replacement of many hard-to-route upper and lower cooling system applications. Its bendable construction helps it follow the angles and planes of original equipment hose layouts while improving sealing surface contact for better leak resistance.

For repair work on vehicles such as the Toyota Pickup, Nissan Pathfinder, and Mazda B2200, this Gates Flexible Coolant Hose (Standard) provides a practical solution when an OE-shaped hose is difficult to source.

Key features

• Part number 25251
• Flexible coolant hose design for complex routing
• EPDM and steel construction for cooling system durability
• 1.25 in. inside diameter at both ends
• 13 in. centerline length
• Improved sealing surface for stronger leak resistance
• Non-molded design for broad application coverage

Product details

Gates Vulco-Flex II hose is engineered to replicate the angles and planes of many OE coolant hoses without requiring a molded replacement shape. The EPDM rubber body is reinforced with steel for added structure, while the flexible form makes it easier to route in upper radiator hose and lower radiator hose positions. This makes the Gates 25251 a strong choice for cooling system service where fitment depends on hose length, diameter, and bend pattern rather than a molded profile.

Compatible With many applications across Chrysler, Dodge, Ford, Honda, Isuzu, Mazda, Mitsubishi, Nissan, Toyota, BMW, Audi, Saab, and more, this hose is listed for 1961-1999 vehicles in upper, lower, and pipe-to-radiator positions. This part cross-references Dayco 81031 and Dorman - HELP 67926 for the same application.

Common repair uses

• Replacing a cracked or hardened radiator coolant hose
• Restoring coolant flow after hose collapse or deformation
• Repairing a leaking upper hose or lower hose connection
• Servicing vehicles with hard-to-match OE hose routing
• Addressing cooling system seepage at the hose sealing surface

Installation notes and tips

Verify hose diameter, centerline length, and routing before installation. This hose measures 1.25 inches at both ends and 13 inches centerline length, so it should be matched to the vehicle’s original hose path and connection points. Review the fitment notes carefully for position-specific applications such as upper, lower, upper - pipe to radiator, and lower - pipe to radiator. Some listed vehicles include exclusions for air conditioning or engine configuration.

Quality assurance

Gates designs the Vulco-Flex II line for durable cooling system service with improved sealing contact and flexible routing characteristics. Part number 25251 is built to serve as a practical OE-style replacement where a standard molded hose is not required.