Denso 221-3404 Radiator

Overview of the Denso Radiator 221-3404 for Nissan and Infiniti

The Denso radiator part number 221-3404 is designed specifically for select Nissan and Infiniti models, including the Pathfinder and QX4. This radiator features precise core dimensions and includes a transmission oil cooler, ensuring efficient engine cooling and transmission performance.

• Core Height: 19.687 inches
• Core Width: 27.187 inches
• Core Thickness: 1.000 inch
• Inlet Diameter: 1.375 inches
• Outlet Diameter: 1.375 inches
• Includes Transmission Oil Cooler

Detailed Specifications and Features

The Denso 221-3404 radiator is engineered with a core height of 19.687 inches and a width of 27.187 inches, providing ample surface area for heat dissipation. Its 1-inch core thickness balances cooling efficiency with durability. Both the inlet and outlet diameters measure 1.375 inches, compatible with the cooling system hoses of the Nissan Pathfinder and Infiniti QX4. The integrated transmission oil cooler supports transmission fluid temperature regulation, which is critical for maintaining transmission longevity and performance under various driving conditions.

Compatible Vehicles and Applications

This radiator is compatible with the following vehicles:

• Nissan Pathfinder
• Infiniti QX4

It is designed to replace original equipment radiators in these models, ensuring proper fit and function.

Common Issues Addressed by This Radiator

• Overheating due to radiator core damage or clogging
• Transmission overheating from a faulty or missing transmission oil cooler
• Coolant leaks from worn or cracked radiator components
• Reduced engine performance caused by inefficient cooling
• Corrosion or physical damage to the original radiator

Installation Notes and Tips

When installing the Denso 221-3404 radiator, ensure all hose connections match the 1.375-inch inlet and outlet diameters for a secure fit. Verify that the transmission oil cooler lines are properly connected to maintain transmission cooling. It is recommended to flush the cooling system before installation to remove debris and contaminants. Use manufacturer-recommended coolant and check for leaks after installation. Professional installation is advised to ensure optimal performance and fitment.

Quality Assurance and Warranty

Denso radiators are manufactured to meet or exceed OEM specifications, providing reliable cooling system performance. The 221-3404 radiator undergoes rigorous quality control testing to ensure durability and compatibility with Nissan Pathfinder and Infiniti QX4 models. Warranty coverage details should be confirmed with the distributor or manufacturer, as they may vary by region.