Gates 25321 Radiator Coolant Hose - Lower or Upper

Flexible coolant hose for demanding routing

The Gates 25321 Flexible Coolant Hose is built for applications where a formed hose is difficult to source or where the original routing requires multiple angles. This Vulco-Flex II design bends in almost any direction and uses an improved sealing surface to help reduce leaks during radiator hose replacement.

Compatible With Chevrolet G10, G20, G30, GMC G1500, G2500, G3500, and select Chrysler, Dodge, Plymouth, Cadillac, and Chevrolet/GMC van, truck, and chassis applications, this hose is a practical OE-style solution for upper and lower coolant routing. The Gates Flexible Coolant Hose (Standard) line is made for direct-fit replacement work where durability and accurate hose geometry matter.

Key features

• Gates Vulco-Flex II radiator coolant hose construction
• Flexible design bends in nearly any direction for easier routing
• Improved sealing surface for greater leak resistance
• EPDM and steel construction for cooling-system durability
• End sizes: 1.25 in. (32 mm) to 1.5 in. (38 mm)
• Centerline length: 44 in. (1118 mm)
• Non-molded hose design for broad application coverage

Detailed description

Gates 25321 is a radiator coolant hose engineered to replace expensive OE hoses with a flexible, cost-effective alternative. Its non-molded construction helps it replicate a wide range of hose angles and planes, making it a strong choice when servicing older Chevrolet G30 and GMC G3500 vans, as well as Chrysler Town & Country, Dodge Caravan, and Grand Caravan models with heavy-duty cooling systems. This part cross-references BBB Industries 52044 and Walker Exhaust 31628 for the same application.

What this hose can help address

• Cracked or hardened upper or lower radiator hose sections
• Coolant leaks at worn hose sealing surfaces
• Fitment challenges when a molded hose is no longer available
• Routing issues on vehicles with complex cooling-system layouts
• Replacement needs on aging Chevrolet, GMC, Chrysler, Dodge, Plymouth, and Cadillac applications

Installation notes and tips

• Verify end diameters and centerline length before installation.
• Confirm whether the vehicle uses an upper or lower hose position listed in the fitment data.
• Inspect hose clamps, necks, and adjoining cooling-system components before assembly.
• Check clearance through the full routing path to avoid contact with moving or hot components.
• Use the vehicle-specific fitment notes for heavy-duty cooling systems, HVAC, serpentine belt, chassis-mounted, or W/O A.P. applications.

Quality assurance

Built by Gates, a recognized name in cooling-system replacement parts, this hose uses EPDM and steel materials for dependable service in radiator hose applications. The Vulco-Flex II design focuses on flexible routing and improved sealing performance for a direct replacement solution.