Dayco 72999 Radiator Coolant Hose - Upper

Dayco 72999 Curved Radiator Hose for Lexus GX460

Dayco 72999 is a curved radiator coolant hose built for upper cooling-system routing on the Lexus GX460. Made from EPDM and finished in black, it follows the OE-style shape needed for a clean, secure coolant connection in the engine bay.

Key Features

• EPDM construction for coolant-system durability
• Curved radiator hose design for upper hose routing
• 1 1/2 in. inside diameter at both ends
• 1 7/8 in. outside diameter at both ends
• Single I.D. hose configuration
• Black finish for a factory-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Product Details

This Dayco curved radiator hose is engineered for the upper radiator connection on 2010-2023 Lexus GX460 models. The hose line is part of Dayco’s Curved Radiator Hose product line, which focuses on formed coolant hoses that match the routing and connection points used in vehicle cooling systems. Dayco 72999 is a direct-fit style replacement for the Lexus GX460 upper radiator hose application, with matching end diameters and a formed profile that supports proper hose alignment.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Cooling Issues This Hose Can Address

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

Installation Notes and Tips

Fits 2010-2023 Lexus GX460, upper. Confirm the hose routing, end diameters, and connection points before installation. Inspect clamps, radiator necks, and adjoining coolant components for wear or corrosion, and replace any damaged parts before refilling the cooling system. After installation, refill and bleed the system according to the vehicle service procedure to help prevent trapped air.

Quality Assurance

Dayco manufactures this hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and dimensional standards for coolant-hose service.