Dayco 71221 Engine Coolant Bypass Hose

Dayco Curved Radiator Hose 71221

Dayco 71221 is a curved radiator hose built for coolant bypass service in select Volkswagen and Audi applications. Made from EPDM rubber with a black finish, it uses a single I.D. hose design and matches SAE J20R4 Class D-1 and SAE J1684 Type EC requirements.

This Dayco Curved Radiator Hose line is focused on OE-style hose routing and fitment for vehicles that need a formed coolant hose with the correct bend profile. For buyers searching for a Volkswagen Golf radiator hose, Volkswagen Jetta coolant bypass hose, or Audi 4000 curved radiator hose, part number 71221 is a direct application-specific option.

• EPDM construction for coolant system service
• Black finish for a factory-style appearance
• Single I.D. hose with 31/32 in. inside diameter at both ends
• Curved radiator hose profile for routed coolant connections
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco part number 71221 for application lookup and cross-reference

Use this hose as a coolant bypass hose where the vehicle calls for a formed, curved radiator hose with matching end diameters. It is listed for 1984-1987 Audi 4000, 1984-1985 Volkswagen Quantum, 1984 Volkswagen Rabbit Convertible, 1984-1991 Volkswagen Jetta, 1985-1991 Volkswagen Golf, 1985-1993 Volkswagen Cabriolet, 1987-1993 Volkswagen Fox, and 1992 Volkswagen Golf and Jetta with air conditioning. This part cross-references Gates 21517 and NAPA 8230 for the same application.

What This Hose Helps Address

• Cracked or split coolant bypass hose
• Coolant seepage at a formed hose connection
• Softening or swelling from age and heat exposure
• Incorrect hose routing on a curved radiator hose application
• Replacement needs for Volkswagen Golf, Volkswagen Jetta, and Audi 4000 cooling systems

Installation Notes

Verify end diameters, hose routing, and vehicle configuration before installation. The 1992 Volkswagen Golf and 1992 Volkswagen Jetta listings note air conditioning-equipped vehicles. Inspect adjoining necks, clamps, and coolant passages for wear or corrosion before installing Dayco 71221.

Quality Assurance

Dayco manufactures this hose to published SAE specifications for coolant hose service and application-specific fitment. Part number 71221 is built for the listed Volkswagen and Audi cooling system applications.