Denso 221-3421 Radiator

Denso 221-3421 Radiator for Infiniti G35

Denso 221-3421 is a radiator built for 2003-2004 INFINITI G35 applications. It combines OE-style fitment with a transmission oil cooler included, making it a direct cooling-system replacement for the G35 platform.

Key Features

• Fits 2003-2004 INFINITI G35, N/A
• Core dimensions: 15.7500 in. height, 27.1870 in. width, 0.6250 in. thickness
• Inlet diameter: 1.4370 in.; outlet diameter: 1.4370 in.
• Transmission oil cooler included
• OE-focused radiator configuration for proper engine cooling and fitment
• Part number: 221-3421

Detailed Description

This Denso radiator is engineered around OE specifications for the 2003-2004 Infiniti G35, with tank design, fin pitch, core size, and materials selected to match factory requirements. Denso’s radiator program is built from OE supplier experience, and each unit is tested for durability and function to support consistent cooling performance under demanding driving conditions. If you are replacing a worn or leaking radiator on an Infiniti G35, Denso 221-3421 provides the correct core dimensions and integrated transmission oil cooler layout for a straightforward replacement.

This part cross-references Spectra Premium CU2455 for the same application.

Common Problems This Radiator Can Address

• Engine overheating caused by a restricted or damaged radiator core
• Coolant leaks from cracked tanks or weakened seams
• Transmission fluid temperature control issues when the factory cooler is part of the radiator assembly
• Reduced cooling efficiency from bent fins or internal blockage
• Fitment issues from using a radiator with incorrect inlet, outlet, or core dimensions

Installation Notes and Tips

Verify the radiator dimensions, inlet and outlet sizes, and transmission cooler routing before installation. Flush the cooling system, inspect hoses and clamps, and confirm the fan assembly and shrouding are in good condition. After installation, refill with the correct coolant mixture and bleed air from the system according to factory service procedures.

Quality Assurance

Denso supplies radiators to OE car makers worldwide, and this radiator is built to meet rigid manufacturer standards for fitment, performance, and durability. Each unit passes strict function and durability testing before release.