Dayco 72742 Radiator Coolant Hose - Upper

Dayco Curved Radiator Hose 72742

The Dayco 72742 curved radiator hose is a direct-fit coolant hose for select BMW X3 applications. Built from EPDM rubber and formed as a single I.D. hose, it is shaped to route coolant cleanly through the upper cooling circuit while maintaining a consistent 1 1/2-inch inside diameter at both ends.

Compatible with 2004-2006 BMW X3 upper radiator hose applications, this Dayco radiator coolant hose is engineered to match the original routing and connection size used in the vehicle’s cooling system. The Dayco curved radiator hose line focuses on formed hose geometry for accurate fitment in applications where a straight hose will not follow the factory path.

Key Features

• Part number 72742
• Fits 2004-2006 BMW X3, upper
• EPDM construction for coolant-system use
• Black finish for OE-style appearance
• 1 1/2-inch inside diameter at both ends
• Single I.D. hose design
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved hose profile for factory-style routing

Product Details

Dayco 72742 is a curved radiator hose designed for upper coolant routing on the BMW X3. The EPDM rubber construction is selected for radiator and heater hose service, while the formed shape helps maintain the correct path between connection points. With matching 1 1/2-inch end diameters and a black exterior, this hose supports a clean OE-style replacement on 2004-2006 BMW X3 models. The Dayco curved radiator hose line is built for applications where hose shape is as important as hose size, and part number 72742 reflects that fit-focused design.

Common Cooling System Issues This Hose Can Address

• Cracked or split upper radiator hose
• Coolant leakage at the hose body or ends
• Softening, swelling, or deterioration from heat and age
• Poor hose routing caused by an incorrect replacement shape
• Restricted cooling-system sealing at the connection points

Installation Notes and Tips

Verify the vehicle application before installation and confirm the upper hose routing matches the original configuration on your BMW X3. Inspect the radiator neck, engine outlet, and clamps for wear or corrosion before installing the new hose. Make sure the hose seats fully on both 1 1/2-inch connections and follow the vehicle manufacturer’s cooling-system service procedure when refilling and bleeding the system.

Quality Assurance

This Dayco hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator hose service. Part number 72742 is built as a formed coolant hose for the specified BMW X3 upper radiator application.