Dayco 73128 Radiator Coolant Hose - Upper

Curved Upper Radiator Hose for VW and Audi

Dayco 73128 is a curved upper radiator coolant hose built for specific Volkswagen and Audi applications. It uses EPDM construction with a black finish and a protective sleeve to help manage heat and abrasion in the cooling system.

Compatible with 2008-2014 Volkswagen GTI, upper; 2008-2013 Audi A3, upper; 2012-2013 Volkswagen Beetle, upper; 2012-2013 Volkswagen Jetta, upper; 2008-2009 Volkswagen Jetta, upper; and 2009-2011 Volkswagen Eos, upper.

Key Features

• Dayco Curved Radiator Hose, part number 73128
• EPDM rubber construction for coolant-system service
• Black branched hose design
• Protective sleeve included; heat shield not included
• End sizes: 1 1/4 in., 1 7/16 in., and 5/16 in.
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Product Details

Dayco 73128 is a branched upper radiator hose for vehicles that use a curved coolant routing path. The hose is formed from EPDM and built to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, making it a direct replacement choice for cooling-system service on select Volkswagen and Audi models. The protective sleeve adds an extra layer where routing and engine-bay exposure can create wear. Dayco 73128 is a practical replacement when servicing a leaking, cracked, or heat-aged upper radiator hose on a Volkswagen GTI, Audi A3, or other listed applications.

What It Helps Address

• Coolant leaks from a cracked or split upper radiator hose
• Softening, swelling, or deterioration from heat and age
• Restricted coolant flow caused by hose collapse or internal wear
• Chafing in routed hose sections that need added protection
• Cooling-system service on a Volkswagen GTI, Audi A3, or Volkswagen Jetta with the listed fitment

Installation Notes and Tips

Verify hose routing, end diameters, and upper-position fitment before installation. Inspect adjoining clamps, thermostat housing connections, and radiator necks for wear or corrosion before reassembly. Confirm the protective sleeve is positioned correctly along the exposed section of the hose. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for cooling-system service. The EPDM material and protective sleeve support durable fitment in the specified Volkswagen and Audi applications.