Dayco 88503 HVAC Heater Hose - Pipe To Heater

Dayco Small I.D. Heater Hose for VW Golf and Jetta

Dayco Part Number 88503 is a branched HVAC heater hose built for specific Volkswagen heater pipe-to-heater applications. It uses EPDM construction and SAE J20R3 Class D-1 / SAE J1684 Type EC specifications to match the demands of coolant routing in the heating system.

Compatible With 2001-2005 Volkswagen Jetta, Pipe To Heater, and 2002-2006 Volkswagen Golf, Pipe To Heater. This Dayco 88503 hose is shaped for vehicles with a quick connect and small I.D. heater hose routing.

Key Features

• EPDM rubber construction for heater hose service
• Black finish for OE-style appearance
• Branched hose design for multi-path coolant routing
• End 1 inside diameter: 7/8 in.
• End 2 inside diameter: 31/32 in.
• End 3 inside diameter: 5/16 in.
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco 88503 small I.D. heater hose for Volkswagen cooling and HVAC routing

Product Details

Dayco’s Small I.D. Heater Hose line focuses on heater and coolant transfer applications that require accurate hose sizing and reliable routing. Part Number 88503 is a branched hose with a trunk height of 13 1/2 inches, making it suitable for the factory-style pipe-to-heater layout used on select Volkswagen Golf and Volkswagen Jetta models. The EPDM material is commonly used in coolant systems because it handles heat and fluid exposure associated with heater hose service.

This hose is listed for 2001-2005 Volkswagen Jetta and 2002-2006 Volkswagen Golf applications with quick connect and small I.D. heater hose notes. If you are searching for a Volkswagen Golf heater hose replacement or a Volkswagen Jetta pipe to heater hose, Dayco 88503 matches those fitment details directly.

Common Issues This Hose Can Address

• Cracked or aged heater hose material
• Coolant seepage at the heater pipe connection
• Restricted heater coolant flow from a damaged hose
• Improper routing caused by a failed branched hose
• Loss of cabin heat related to hose deterioration

Installation Notes and Tips

Verify the vehicle’s heater hose routing, quick connect style, and end diameters before installation. Compare the original hose shape and branch layout to the Dayco 88503 to confirm the pipe-to-heater configuration on your Volkswagen Golf or Jetta. Inspect adjoining clamps, connectors, and heater pipes for wear or corrosion before reassembly.

Quality Assurance

Dayco manufactures this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for heater hose applications. The Small I.D. Heater Hose product line is built around application-specific sizing and routing for direct-fit coolant transfer service.