Denso 221-3428 Radiator

Denso Radiator for Infiniti M35 and M45

Denso 221-3428 is an OE-style radiator built for direct replacement in select Infiniti applications. It is engineered around core dimensions, tank design, fin pitch, and materials that align with original equipment standards for dependable engine cooling and consistent fitment.

Compatible with 2006-2010 Infiniti M45 and 2009-2010 Infiniti M35, this radiator includes an integrated transmission oil cooler and uses 1.375-inch inlet and outlet connections for the specified applications.

Key Features

• Core height: 17.6870 in.
• Core width: 28.6870 in.
• Core thickness: 0.6250 in.
• Transmission oil cooler included
• Inlet diameter: 1.3750 in.
• Outlet diameter: 1.3750 in.
• OE-focused construction for fitment and cooling performance

Detailed Description

Denso 221-3428 is a radiator replacement for Infiniti M35 and Infiniti M45 models that require a radiator with the listed core dimensions and integrated transmission oil cooler. Denso supplies radiators to vehicle manufacturers worldwide, and this unit is built to meet the dimensional and functional standards expected in OE cooling systems. The result is a radiator intended to maintain proper engine temperature control while matching the original application layout.

This part cross-references APDI 8013012 and Spectra Premium CU13012 for the same application. For buyers searching for a radiator for 2009-2010 Infiniti M35 or a radiator for 2006-2010 Infiniti M45, part number 221-3428 provides a direct-reference option with the specified inlet and outlet sizing.

What This Radiator Helps Address

• Overheating caused by a failing or restricted radiator
• Coolant leaks from cracked tanks or worn core assemblies
• Reduced cooling efficiency from damaged fins or internal blockage
• Transmission fluid temperature control concerns in equipped vehicles
• Fitment issues when replacing an OE-style Infiniti M35 or M45 radiator

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet size, and transmission cooler connection points before installation. Flush the cooling system, inspect hoses and clamps, and confirm the cooling fan, thermostat, and coolant condition are in good working order before installing the new unit. Use the vehicle’s specified coolant and bleed the system carefully to remove trapped air after installation.

Quality Assurance

Denso radiators are built using OE-based engineering and are subjected to durability and function testing before release. That manufacturing approach supports consistent performance, reliable fitment, and dependable cooling under demanding driving conditions.