Part #: 221-3429

Denso 221-3429 Radiator

⚙️ 5 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$179.26Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: INFINITI, M45 and Q45
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of the Denso Radiator 221-3429 for Infiniti M45 and Q45

The Denso Radiator part number 221-3429 is designed specifically for Infiniti M45 and Q45 models. This radiator features precise core dimensions and includes a transmission oil cooler, ensuring efficient engine and transmission cooling for these vehicles.

  • Core Height: 17.687 inches
  • Core Width: 27.062 inches
  • Core Thickness: 0.625 inches
  • Inlet Diameter: 1.375 inches
  • Outlet Diameter: 1.375 inches
  • Includes Transmission Oil Cooler

Detailed Product Description

The Denso 221-3429 radiator is engineered with a core height of 17.687 inches, a width of 27.062 inches, and a thickness of 0.625 inches, providing optimal surface area for heat dissipation. Both the inlet and outlet diameters measure 1.375 inches, matching the factory specifications for seamless integration. This radiator also incorporates a transmission oil cooler, which helps maintain proper transmission fluid temperature, contributing to the longevity and performance of the transmission system in Infiniti M45 and Q45 vehicles.

Compatible Vehicles and Applications

This radiator is compatible with the following Infiniti models:

  • Infiniti M45
  • Infiniti Q45

It is designed to replace the original radiator and transmission oil cooler assembly, addressing issues related to engine overheating and transmission fluid temperature regulation.

Common Issues Addressed by This Radiator

  • Engine overheating due to radiator core damage or clogging
  • Transmission overheating caused by inefficient transmission oil cooling
  • Coolant leaks from worn or damaged radiator components
  • Reduced cooling efficiency from corrosion or buildup inside the radiator
  • Inadequate heat dissipation affecting engine and transmission performance

Installation Notes and Tips

When installing the Denso 221-3429 radiator, ensure that the inlet and outlet hoses match the 1.375-inch diameter specifications for proper fitment. Verify that the transmission oil cooler lines are correctly connected to maintain transmission fluid flow. It is recommended to inspect and replace any worn hoses or clamps during installation to prevent leaks. Proper bleeding of the cooling system after installation will help avoid air pockets and ensure optimal cooling performance.

Quality Assurance and Warranty

Denso radiators are manufactured to meet or exceed OEM standards, ensuring reliable performance and durability. The 221-3429 radiator undergoes rigorous quality control testing to verify core integrity and cooling efficiency. Please refer to Denso's official warranty policy for specific coverage details related to this radiator.

BrandDenso
Part Number221-3429
Core Height17.6870
Core Thickness0.6250
Core Width27.0620
Transmission Oil Cooler IncludedYes
Inlet Diameter1.3750
Outlet Diameter1.3750

This part fits 5 vehicles. Search below:

YearMakeModelPositionNotes
2004INFINITIM45N/A
2004INFINITIQ45N/A
2003INFINITIM45N/A
2003INFINITIQ45N/A
2002INFINITIQ45N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

8012426

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.