Dayco 73120 Radiator Coolant Hose - Upper or Upper - Main Radiator

Dayco Curved Radiator Hose 73120

Dayco 73120 is a branched radiator coolant hose built for upper radiator routing on select BMW applications. Made from EPDM and finished in black, it follows the OE-style curved layout needed for proper coolant flow in the engine cooling system.

Key Features

• EPDM construction for coolant hose service
• Black finish for a factory-style appearance
• Branched hose design with multiple formed ends
• End sizes: 1 7/16 in., 1 7/16 in., 3/8 in., and 7/8 in.
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Upper radiator hose routing for select BMW 335i, 435i, M235i, and M2 models

Product Details

This Dayco curved radiator hose is engineered as a branched coolant hose for upper main radiator use. The molded EPDM construction helps maintain the correct hose shape and connection points, while the formed trunk height of 11 supports the routing required in the engine bay. Dayco 73120 is a direct-fit style replacement for select BMW cooling systems, including BMW 335i, BMW 435i, BMW M235i, and BMW M2 applications.

This part cross-references no listed interchange numbers for the same application.

What It Helps Fix

• Coolant leaks at a cracked or aged upper radiator hose
• Softening, swelling, or collapse of the original hose
• Improper coolant routing caused by a damaged branched hose
• Loss of cooling-system pressure from worn hose connections
• Overheating concerns related to hose failure in the upper radiator circuit

Installation Notes and Tips

Verify the hose routing, end diameters, and upper radiator position before installation. This hose is listed for Fits 2012-2013 BMW 335i, upper; Fits 2013 BMW ActiveHybrid 3, upper; Fits 2013-2015 BMW 335i xDrive, upper; Fits 2014-2016 BMW 335i GT xDrive, upper; Fits 2014-2016 BMW 435i, upper - main radiator; Fits 2014-2015 BMW 435i xDrive, upper; Fits 2014-2016 BMW M235i, upper; Fits 2015-2016 BMW 435i Gran Coupe, upper - main radiator; Fits 2015-2016 BMW 435i xDrive Gran Coupe, upper - main radiator; Fits 2015-2016 BMW M235i xDrive, upper; Fits 2016 BMW 435i xDrive, upper - main radiator; and Fits 2016-2018 BMW M2, upper - main radiator. Confirm the cooling system is fully drained and the mating surfaces are clean before connecting the hose.

Quality Assurance

Dayco manufactures cooling-system hoses to meet published SAE specifications for material and performance requirements. The EPDM construction and molded branched design support consistent fitment for BMW upper radiator hose replacement service.