Denso 221-3429 Radiator
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Denso

Denso 221-3429 Radiator

Brand Denso 221-3429
Core Height 17.6870
Core Thickness 0.6250
Core Width 27.0620
Transmission Oil Cooler Included Yes
Inlet Diameter 1.3750
Outlet Diameter 1.3750
Fits INFINITI · 5 vehicles

OE experience. Built with radiator know-how from a leading OE supplier.

Strict durability testing. Each radiator is tested for dependable performance under demanding conditions.

Transmission oil cooler included. Integrated cooling support adds convenience and value.

Cross-references APDI 8012426, CSF 3114 and CSF 3395 for the same application. See all 11.

$179.26Free shipping
In stock · usually ships same day before 1pm CST
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Order total $179.26
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Denso Radiator for Infiniti M45 and Q45

The Denso 221-3429 radiator is built for direct-fit cooling performance in select Infiniti applications. It combines OE-style dimensions, integrated transmission cooling, and Denso’s OE manufacturing experience to support stable engine temperature control in demanding driving conditions.

  • Core height: 17.6870 in.
  • Core width: 27.0620 in.
  • Core thickness: 0.6250 in.
  • Inlet diameter: 1.3750 in.
  • Outlet diameter: 1.3750 in.
  • Transmission oil cooler included
  • OE-style radiator construction for fitment and cooling consistency

OE-Style Cooling Performance

Denso Part Number 221-3429 is engineered to match OE radiator configuration standards, including tank design, fin pitch, core dimensions, and material selection. That attention to detail helps maintain proper coolant flow and heat transfer for the 2003-2004 Infiniti M45 and the 2002-2004 Infiniti Q45. If you are replacing a worn or leaking radiator, this Denso radiator supports the cooling system with the fit and function expected from an OE supplier.

This part cross-references Spectra Premium CU2426 for the same application.

Common Reasons to Replace

  • Coolant leaks from a cracked or aging radiator
  • Overheating caused by reduced heat dissipation
  • Transmission temperature concerns tied to radiator cooler failure
  • Restricted coolant flow from internal buildup or corrosion
  • Fitment issues after a previous repair or collision damage

Installation Notes

Fits 2003-2004 Infiniti M45, N/A. Fits 2002-2004 Infiniti Q45, N/A. Verify inlet and outlet hose sizes, mounting points, and cooler line routing before installation. Flush the cooling system, inspect hoses and clamps, and refill with the correct coolant mixture after replacement. Denso Part Number 221-3429 is a direct-fit radiator for these confirmed applications.

Quality Assurance

Denso supplies radiators to OE vehicle manufacturers worldwide, and this radiator is built to meet strict durability and function testing standards. The result is a cooling component designed to deliver consistent performance and reliable fitment for the listed Infiniti applications.

Related reading

This part fits 5 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2004INFINITIM45N/A—
2004INFINITIQ45N/A—
2003INFINITIM45N/A—
2003INFINITIQ45N/A—
2002INFINITIQ45N/A—
Directly replaces or cross-references 11 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
APDI — 8012426CSF — 3114CSF — 3395DPI Performance Racing Products — 2426Infiniti — 21460-AR000Infiniti — 21460-AR500OSC — 2426Reach Cooling — 41-2426Spectra Premium — CU2426TYC Cooling - Archived — 2426Vista Pro — 432604