Vaico V10-4284 Radiator Coolant Hose - Upper

Radiator Coolant Hose for Audi A4

VAICO V10-4284 is a radiator coolant hose for the upper cooling circuit on select Audi A4 and Audi A4 Quattro models. Built to match the OE reference 8E0121101R, it supports proper coolant routing from the radiator to the pipe on 2005-2009 applications.

Key Features

• Upper radiator coolant hose for the cooling system
• Length: 242 mm for application-specific routing
• Height: 70 mm and width: 187 mm
• OE reference: 8E0121101R
• Brand line: VAICO replacement part for cooling-system service
• Cross-reference: Dayco 72736 and Rein CHR0397 for the same application

Detailed Description

VAICO V10-4284 is a radiator coolant hose engineered for the upper radiator-to-pipe connection on Audi A4 and Audi A4 Quattro vehicles. The part number V10-4284 is listed for 2005-2009 Audi A4, Upper, and 2005-2009 Audi A4 Quattro, Upper, with notes referencing OE No. 8E0121101R. Its 242 mm length and compact profile help it follow the factory routing in the engine bay while maintaining the correct connection point in the cooling circuit.

VAICO’s VAICO product line focuses on replacement components for European vehicle maintenance, and this hose is specified for direct cooling-system service where the original upper hose has aged, softened, or developed leaks. For buyers searching for an Audi A4 upper radiator hose, Audi A4 Quattro coolant hose, or OE replacement hose V10-4284, this part matches the listed application data.

What It Helps Address

• Coolant seepage at the upper radiator hose connection
• Cracking or hardening of the original hose material
• Loss of coolant from a worn radiator-to-pipe hose
• Incorrect hose routing after prior cooling-system repair
• Fitment issues when replacing an OE No. 8E0121101R hose

Installation Notes and Tips

Verify the OE number, hose routing, and upper-position fitment before installation. Inspect adjoining clamps, pipe ends, and radiator neck surfaces for wear or corrosion so the new hose seals correctly. Confirm the hose follows the factory path on the Audi A4 or Audi A4 Quattro cooling system before refilling and bleeding the system.

Quality Assurance

VAICO V10-4284 is built as an OE-referenced replacement for the listed Audi applications and cross-references to Dayco 72736 and Rein CHR0397 for the same use case. Confirmed fitment includes 2005-2009 Audi A4, Upper, and 2005-2009 Audi A4 Quattro, Upper.