Dayco 73043 Radiator Coolant Hose - Upper

Curved Upper Radiator Hose for Sonic

Dayco 73043 is a curved radiator coolant hose built for upper cooling-system routing on select Chevrolet Sonic models. Made from EPDM and finished in black, it provides a direct replacement option for vehicles that need a 1 1/4-inch inside diameter hose at both ends.

Key Features

• EPDM construction for cooling-system service
• Black finish for a clean OE-style appearance
• 1 1/4 in. inside diameter at End 1 and End 2
• 1 21/32 in. outside diameter at End 1 and End 2
• Single I.D. hose design
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Fits 2012-2020 Chevrolet Sonic, upper

Detailed Description

This Dayco curved radiator hose is engineered for upper radiator coolant routing and is listed for 2012-2020 Chevrolet Sonic applications. The curved profile helps match the factory hose path, while the EPDM rubber construction is suited for coolant exposure and underhood temperature cycling. Part number 73043 is a practical replacement when the original upper hose shows age, cracking, or leakage.

Dayco’s Curved Radiator Hose line focuses on application-specific hose shapes and dimensions for cooling-system service. For buyers searching for a Chevrolet Sonic upper radiator hose, Dayco 73043 provides the correct 1 1/4-inch end sizing and a single I.D. hose layout for the listed fitment.

What It Helps Fix

• Coolant leaks from a cracked or deteriorated upper hose
• Softening, swelling, or hardening of the original hose material
• Improper hose routing caused by a misshaped replacement hose
• Cooling-system service needs on a 2012-2020 Chevrolet Sonic
• Loss of coolant from worn hose ends or aging rubber

Installation Notes and Tips

Verify the hose routing and end diameters before installation. Inspect the radiator neck, engine connection points, and clamps for wear or corrosion, and replace damaged components as needed. Confirm the hose is seated fully and routed without kinks or twist before refilling and bleeding the cooling system.

Quality Assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent cooling-system service requirements. Part number 73043 is a direct-fit style replacement for the listed Chevrolet Sonic upper hose application.