Denso 221-3425 Radiator

Denso Radiator for Infiniti FX35, FX50 and QX70

The Denso 221-3425 radiator is built for direct-fit cooling performance on select Infiniti applications. It combines OE-style dimensions, integrated transmission oil cooler support, and matched inlet and outlet sizing to help maintain stable engine temperature under daily driving and towing demands.

• Core height: 25.0620
• Core width: 20.5620
• Core thickness: 1.0000
• Transmission oil cooler included: yes
• Inlet diameter: 1.3750
• Outlet diameter: 1.3750

OE-Style Cooling Construction

Denso designs radiators to meet original equipment standards for configuration, tank design, fin pitch, core dimensions, and materials. Part number 221-3425 reflects that OE-focused approach, giving Infiniti FX35, FX50, and QX70 owners a radiator engineered for proper fitment and dependable heat transfer. The integrated transmission oil cooler adds support for vehicles that route automatic transmission fluid through the radiator assembly.

This part cross-references APDI 8013079 and Spectra Premium CU13079 for the same application.

What This Radiator Helps Address

• Engine overheating from a restricted or leaking radiator
• Coolant loss caused by cracked tanks or damaged core passages
• Transmission temperature concerns on vehicles with an integrated cooler
• Fitment issues from incorrect core size or hose connection diameter
• Cooling system inefficiency after age-related wear

Fitment Details

• Fits 2014 INFINITI QX70, N/A
• Fits 2009-2013 INFINITI FX50, N/A
• Fits 2009 INFINITI FX35, N/A, w/ Tow Package

Installation Notes and Quality Assurance

Verify hose connection size, mounting points, and transmission cooler line routing before installation. Flush the cooling system, inspect related hoses and clamps, and refill with the correct coolant mixture after the radiator is installed. Denso’s OE supplier background and durability testing support consistent fitment and function for this radiator, part number 221-3425.