CSF 3403 Radiator

OE-Style Cooling for Infiniti Applications

CSF radiator part number 3403 is an OE-style replacement built with a plastic tank and aluminum core design for select Infiniti models. It is engineered as a cross flow radiator with a 1-row core layout to support factory-style cooling performance in the engine bay.

Compatible with Infiniti QX50, QX70, EX37, FX37, FX50, EX35, and FX35 applications, CSF 3403 is built around the dimensions and hose connections needed for direct-fit service. The CSF 1 Row Plastic Tank Aluminum Core line focuses on factory-style fitment with materials chosen for efficient heat transfer and dependable everyday use.

Key Features

• CSF part number 3403
• 1-row cross flow radiator design
• Aluminum core with plastic tanks
• Core thickness: 7/8 in.
• Core width: 20 5/16 in.; core length: 25 in.
• Inlet diameter: 1 3/8 in. right side
• Outlet diameter: 1 3/8 in. left side
• O.E.M.-style plastic tank and aluminum core construction
• High-efficiency plate-type oil cooler section: 10 7/16 in.

Product Details

This CSF radiator is part of the 1 Row Plastic Tank Aluminum Core product line, which is built to match original-style radiator construction while using an aluminum core for heat exchange efficiency. CSF states its radiators are manufactured to high-performance standards, with engineering validation that includes wind tunnel testing and broad application coverage across many vehicle platforms. For Infiniti QX50 and Infiniti QX70 cooling system service, CSF 3403 provides a direct replacement format that aligns with OE-style tank and core construction.

This part cross-references Spectra Premium CU13078 and CU13079 for the same application.

What It Helps Address

• Leaking or cracked radiator tanks
• Restricted coolant flow from an aging core
• Overheating caused by reduced heat transfer
• Cooling system service on a damaged OE-style radiator
• Replacement needs for Infiniti QX50, QX70, EX35, FX35, FX37, EX37, and FX50 models

Installation Notes

Fits 2017 Infiniti QX50, N/A. Fits 2016 Infiniti QX50, N/A. Fits 2014-2015 Infiniti QX50, N/A. Fits 2014-2017 Infiniti QX70, N/A. Fits 2013 Infiniti EX37, N/A. Fits 2013 Infiniti FX37, N/A. Fits 2009-2013 Infiniti FX50, N/A. Fits 2008-2012 Infiniti EX35, N/A. Fits 2009-2012 Infiniti FX35, N/A.

Use the specified mini, 20 psi cap where noted in the fitment data. Verify inlet and outlet orientation, mounting points, and hose routing before installation. This radiator uses a cross flow layout with right-side inlet and left-side outlet connections, so matching the vehicle’s original configuration is important for proper fit.

Quality Assurance

CSF manufactures radiators in ISO/TSO-certified facilities and validates cooling performance through laboratory testing. The brand has supplied radiators worldwide for more than 50 years and has produced over 30 million units across its catalog.