Denso 221-4406 Radiator

Denso Radiator for Nissan Pickup and Pathfinder

The Denso 221-4406 radiator is built for Nissan cooling-system applications that demand OE-style fit and dependable heat transfer. It is designed for 1986-1997 Nissan Pickup, 1986-1994 Nissan D21, and 1987-1995 Nissan Pathfinder coverage, with transmission oil cooler included for the listed applications.

Key Features

• Core height: 16.9370 in.
• Core width: 25.5000 in.
• Core thickness: 1.0000 in.
• Inlet diameter: 1.3750 in.
• Outlet diameter: 1.3750 in.
• Transmission oil cooler included
• OE-style radiator configuration for proper fitment

Detailed Description

Denso part number 221-4406 is a radiator engineered to match OE manufacturer standards for configuration, tank design, fin pitch, core dimensions, and materials. That attention to detail supports consistent engine cooling and stable operation in Nissan Pickup, Nissan D21, and Nissan Pathfinder applications. Denso’s OE supply experience is reflected in the radiator’s fitment-focused design and durability testing, helping maintain cooling performance under demanding driving conditions.

This part cross-references Spectra Premium CU314 for the same application.

What This Radiator Helps Address

• Engine overheating caused by reduced coolant flow or heat rejection
• Cooling-system leaks from an aging or damaged radiator core
• Transmission temperature concerns in vehicles using an integrated cooler
• Fitment issues when replacing a worn OE radiator on Nissan Pickup, D21, or Pathfinder models
• Restricted cooling performance from corrosion, clogging, or physical damage

Installation Notes and Tips

Verify inlet and outlet hose sizes before installation and confirm the vehicle’s radiator opening matches the listed core dimensions. Because this radiator includes a transmission oil cooler, inspect cooler line connections and replace degraded hoses or clamps as needed. Flush the cooling system before installation to remove debris and old coolant, then refill with the correct coolant mixture and bleed air from the system according to factory procedure.

Quality Assurance

Denso radiators are manufactured to OE-level standards and undergo durability and function testing before release. The 221-4406 is built to deliver reliable cooling performance and consistent fitment for the listed Nissan applications.