Dayco 72365 Radiator Coolant Hose - Lower

Dayco 72365 Curved Radiator Hose Overview

The Dayco 72365 curved radiator hose is a lower coolant hose built for specific GM applications that need a dual I.D. hose profile and a formed bend for proper routing. Made from EPDM and finished in black, it is specified for vehicles such as the Chevrolet Impala, Pontiac Grand Prix, Buick Allure, Buick LaCrosse, and Chevrolet Monte Carlo.

Dayco’s Curved Radiator Hose line focuses on application-specific hose geometry and OE-style cooling system fitment. This Dayco 72365 hose follows the required curved layout for lower radiator connections where a straight hose will not maintain the correct path or clearance.

Key Features

• EPDM construction for coolant system service
• Black finish for a clean OE-style appearance
• Dual I.D. hose design with 1 1/4 in. end 1 inside diameter and 1 1/2 in. end 2 inside diameter
• End outside diameters measure 1 9/16 in. and 1 13/16 in.
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Lower curved radiator hose configuration for proper routing

Product Details

This radiator coolant hose is engineered for lower cooling system routing on 2005-2008 Pontiac Grand Prix, 2006-2009 Chevrolet Impala, 2006-2007 Chevrolet Monte Carlo, and 2008-2009 Buick Allure and Buick LaCrosse. The molded curved shape helps maintain the intended hose path between the radiator and engine-side connection points, while the EPDM material is commonly used in coolant applications for heat and fluid exposure resistance. Dayco 72365 is a direct-fit style replacement for the listed vehicles and applications.

This part cross-references ACDelco 26538X and Gates 23120 for the same application. Dayco 72365 is also referenced by other interchange numbers including Duralast E72365, General Motors 15286585, Goodyear 62583, and NAPA 9781.

Common Cooling System Issues It Can Address

• Lower radiator hose leakage at the hose body or connection ends
• Cracking, swelling, or softening in an aging coolant hose
• Incorrect hose routing after replacement with a non-formed hose
• Coolant seepage caused by poor sealing at the radiator or engine connection
• Restricted fitment when the original curved hose shape is no longer holding form

Installation Notes and Tips

Verify the vehicle year, make, model, and lower hose routing before installation. Compare the inside and outside diameters to the original hose and confirm that the curved shape matches the factory path. Inspect hose clamps, radiator necks, and engine fittings for wear or corrosion before installing the new hose. Fill and bleed the cooling system according to the vehicle service procedure after replacement.

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 cooling system service.