Denso 221-3423 Radiator

Denso 221-3423 Radiator for Infiniti Cooling Systems

The Denso 221-3423 radiator is built for Infiniti applications that need consistent engine temperature control and dependable OE-style fitment. It is engineered with the core dimensions, tank design, fin pitch, and materials needed to match original cooling system requirements.

Compatible with 2008-2017 Infiniti EX35, EX37, FX35, FX37, QX50, and QX70 applications, this radiator includes an integrated transmission oil cooler and is sized for direct replacement use in the listed vehicles.

Key Features

• Core height: 25.0620 in.
• Core width: 20.5620 in.
• Core thickness: 0.6250 in.
• Inlet diameter: 1.3750 in.
• Outlet diameter: 1.3750 in.
• Transmission oil cooler included
• OE-style construction for fitment and cooling performance
• Denso part number 221-3423

Detailed Description

Denso 221-3423 is a replacement radiator developed to meet the cooling demands of Infiniti vehicles with factory-style specifications. Denso supplies radiators to OE car makers worldwide, and this radiator reflects that experience through controlled core dimensions, tank configuration, and material selection. The result is a radiator built to support stable coolant flow and heat transfer in everyday driving and demanding conditions.

This radiator cross-references Spectra Premium CU13078 and CSF 3403 for the same application. It is a direct-fit cooling component for Infiniti EX35, EX37, FX35, FX37, QX50, and QX70 models where the listed dimensions and cooler configuration apply. The Denso 221-3423 is a practical choice when replacing a worn or leaking radiator in these Infiniti platforms.

What This Radiator Helps Address

• Coolant leaks from a damaged or corroded radiator core or tank
• Overheating caused by restricted heat dissipation
• Transmission fluid temperature control through the built-in cooler
• Reduced cooling efficiency from aging internal passages
• Fitment issues when replacing an OE-style Infiniti radiator

Installation Notes and Tips

Verify core dimensions, inlet and outlet size, and transmission cooler routing before installation. Drain the cooling system fully, inspect hoses and clamps for wear, and flush the system if contamination is present. After installation, refill with the correct coolant mixture and bleed air from the system according to factory service procedures.

Fits 2008-2012 Infiniti EX35, N/A. Fits 2013 Infiniti EX37, N/A. Fits 2010-2012 Infiniti FX35, N/A. Fits 2013 Infiniti FX37, N/A. Fits 2014-2017 Infiniti QX50, N/A. Fits 2014-2017 Infiniti QX70, N/A. Fits 2009 Infiniti FX35, N/A; fits models without Tow Package.

Quality Assurance

Denso radiators are produced to OE-level standards and undergo durability and function testing before release. That manufacturing approach supports consistent performance, reliable fitment, and cooling-system dependability for the listed Infiniti applications.