Dayco 72878 Radiator Coolant Hose - Upper

Curved Radiator Hose for Toyota Highlander

Dayco 72878 is a curved radiator coolant hose built for upper cooling system routing on select Toyota Highlander models. Made from EPDM and finished in black, it is shaped to match the OE-style path used in the engine bay for a clean, direct replacement.

Compatible With 2001-2007 Toyota Highlander, upper radiator hose applications, this Dayco Curved Radiator Hose is specified for vehicles that use a 1 5/16 in. inside diameter at both ends. The Dayco 72878 part number is a direct reference for buyers searching for an upper coolant hose replacement for Toyota Highlander cooling repairs.

Key Features

• EPDM construction for coolant hose service
• Black finish for OE-style appearance
• Single I.D. hose design
• 1 5/16 in. inside diameter at both ends
• Curved radiator hose profile for upper routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco 72878 identification for accurate ordering

Product Details

Dayco’s Curved Radiator Hose line focuses on replacement hoses shaped for specific cooling-system layouts, helping maintain proper hose routing and fitment in applications that require a formed upper hose. This Dayco 72878 hose is engineered as an OEM replacement for the upper radiator connection on 2001-2007 Toyota Highlander models, with matching end diameters and a curved profile that follows the factory path. The hose measures 16 1/2 in. in trunk height and uses EPDM material for standard coolant service.

Search terms such as Toyota Highlander upper radiator hose, 2001-2007 Toyota Highlander coolant hose, and Dayco 72878 curved radiator hose all point to the same application.

Common Cooling Issues It Can Address

• Cracked or hardened upper radiator hose material
• Coolant seepage at the hose connection points
• Improper hose routing from a worn or misshaped hose
• Loss of cooling-system integrity from age-related hose wear
• Replacement needs after routine cooling-system service

Installation Notes and Tips

Verify the hose routing, end diameters, and upper position before installation on your Toyota Highlander. Inspect the radiator neck and engine-side connection surfaces for wear, corrosion, or residue before installing Dayco 72878. Confirm that the hose follows the factory curve without twisting so the cooling system maintains proper alignment.

Quality Assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator coolant hose applications. Dayco 72878 is intended as an OE-style replacement for the specified Toyota Highlander fitment.