Dayco 72025 Engine Coolant Bypass Hose

Curved Radiator Hose for Ford, Mazda, and Mercury

Dayco 72025 is a curved radiator hose built as an engine coolant bypass hose for select Ford, Mazda, and Mercury applications. It uses EPDM construction and a single I.D. hose design with 1 1/16-inch inside diameters at both ends for a direct-fit cooling system connection.

The Dayco Curved Radiator Hose line is engineered for vehicle-specific cooling system routing where a formed hose is needed to maintain proper coolant flow and fit around engine bay components. This hose is specified to SAE J20R4 Class D-1 and SAE J1684 Type EC standards.

Key Features

• Dayco 72025 engine coolant bypass hose
• EPDM rubber construction for cooling system service
• Curved radiator hose profile for formed routing
• 1 1/16-inch inside diameter at both ends
• Single I.D. hose design
• Black finish
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Detailed Description

Dayco 72025 is a formed coolant hose designed for vehicles that require a curved radiator hose layout in the cooling circuit. The EPDM material is commonly used in engine coolant service because it is suited to heat and coolant exposure, while the molded shape helps the hose follow the factory routing. This part number is used across applications such as the Ford Ranger, Ford Explorer, Ford Explorer Sport Trac, Ford Mustang, Mazda B4000, Mercury Mountaineer, and Ford Explorer Sport.

This part cross-references Gates 22038 for the same application. Dayco 72025 is a practical replacement choice when servicing a curved radiator hose or engine coolant bypass hose on the listed vehicles.

What It Is Used For

• Replacing a leaking or cracked curved radiator hose
• Restoring coolant circulation in the bypass circuit
• Addressing soft, swollen, or heat-aged hose material
• Correcting fitment issues caused by an incorrect hose shape
• Servicing cooling system leaks on Ford Ranger, Ford Explorer, and Mazda B4000 applications

Installation Notes and Tips

Verify hose routing, end diameters, and application details before installation. Inspect hose clamps, mating tubes, and nearby cooling system components for wear or corrosion before fitting the new hose. Confirm the hose follows the original curved path without kinks or twist during installation.

Quality Assurance

Dayco manufactures cooling system hoses to published SAE specifications, including SAE J20R4 Class D-1 and SAE J1684 Type EC, to support consistent material and dimensional requirements for service replacement.