Dayco 71348 Engine Coolant Bypass Hose

Dayco Curved Radiator Hose for Engine Cooling

The Dayco 71348 is an engine coolant bypass hose built for curved routing in select Ford and Mazda applications. Made from EPDM rubber with a black finish, it uses a single I.D. hose design with 9/32-inch inside diameter at both ends for a precise cooling-system connection.

Compatible With 1986-1995 Mazda 323, 1987 Mazda B2000, 1992-1996 Mazda MX-3, and 1994-1997 Ford Aspire, this Dayco curved radiator hose supports the coolant flow path used in these vehicles. The 71348 part number is also a direct reference point for buyers searching by OE-style replacement number.

Key Features

• EPDM construction for cooling-system service
• Black hose finish for a clean OE-style appearance
• Single I.D. hose design
• 9/32-inch inside diameter at both ends
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved radiator hose profile for routed coolant applications

Product Details

Dayco 71348 is an engine coolant bypass hose in the Curved Radiator Hose line, made for vehicles that require a formed hose with matching end diameters and compact routing. The EPDM material is selected for coolant-system use, while the curved shape helps match the original hose path in the engine bay. This part number is commonly searched as Dayco 71348 for Ford Aspire and Mazda cooling-system repairs.

This part cross-references ACDelco 14023S and Gates 18206 for the same application.

Common Cooling Issues It Can Address

• Cracked or hardened coolant bypass hose
• Coolant seepage at the hose body or ends
• Restricted coolant flow from a deteriorated hose
• Incorrect hose routing after a previous repair
• Fitment mismatch on select Mazda 323, Mazda MX-3, Mazda B2000, and Ford Aspire applications

Installation Notes and Tips

Verify hose routing, end diameter, and formed shape against the original part before installation. Inspect adjoining coolant pipes, clamps, and connection points for wear or corrosion, and replace any damaged components before filling the system. After installation, refill and bleed the cooling system according to the vehicle service procedure and check for leaks at operating temperature.

Quality Assurance

Dayco manufactures this hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and dimensional standards for cooling-system service.