Dayco 73145 Radiator Coolant Hose - Upper - Radiator To Pipe

Curved Upper Radiator Hose for Buick and Chevrolet

Dayco 73145 is a curved radiator coolant hose built from EPDM for upper radiator-to-pipe service. It is a dual I.D. hose with different end sizes to match the cooling system connection points on select Buick and Chevrolet applications.

Compatible with 2012-2016 Buick LaCrosse and 2012-2016 Buick Regal, as well as 2014 Chevrolet Impala and 2013-2014 Chevrolet Malibu in the upper radiator to pipe position, this hose is shaped for the routing used in those vehicles. The Dayco curved radiator hose line is engineered for direct cooling-system replacement where a formed hose profile is required.

Key Features

• Brand: Dayco
• Part number: 73145
• Curved radiator coolant hose for upper radiator-to-pipe routing
• EPDM construction for cooling system service
• Black finish
• Dual I.D. hose design with 1 5/32 in. end 1 inside diameter and 1 5/16 in. end 2 inside diameter
• End 1 outside diameter: 1 9/16 in.
• End 2 outside diameter: 1 23/32 in.
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Product Details

Dayco 73145 is a formed upper radiator hose designed for vehicles that use a curved hose path between the radiator and pipe connection. The EPDM rubber construction is suited for coolant circulation service, while the dual I.D. layout supports the different connection diameters specified for the application. If you are replacing a worn or leaking upper radiator hose on a Buick LaCrosse, Buick Regal, Chevrolet Impala, or Chevrolet Malibu, this part number provides the correct formed profile for the listed fitments.

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

Common Problems This Hose Can Address

• Coolant seepage at the upper radiator hose connection
• Cracking, hardening, or swelling in the original hose
• Improper hose routing from a collapsed or misshaped hose
• Overheating caused by restricted coolant flow at the hose
• Loss of sealing at the radiator-to-pipe connection

Installation Notes and Tips

Verify the hose routing and end diameters against the vehicle before installation. Inspect the radiator neck, pipe connection, and clamps for wear or corrosion, and replace any damaged sealing surfaces before installing Dayco 73145. Confirm the hose is seated fully and routed without twist or contact points that could shorten service life.

Quality Assurance

Dayco lists this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting its use in cooling-system service for the listed Buick and Chevrolet applications.