Denso 221-9173 Radiator

Denso Radiator for Frontier and Xterra

Denso 221-9173 is a direct-fit radiator built for 2001-2004 Nissan Frontier and 2002-2004 Nissan Xterra applications. It combines OE-style dimensions with an integrated transmission oil cooler to support consistent engine temperature control and dependable cooling performance.

Key Features

• Fits 2001-2004 Nissan Frontier and 2002-2004 Nissan Xterra
• Core dimensions: 17.7165 in. height, 27.0866 in. width, 1.2598 in. thickness
• Transmission oil cooler included
• Inlet diameter: 1.3780 in.
• Outlet diameter: 1.3780 in.
• OE-style radiator configuration for proper fitment
• Part number: 221-9173

Detailed Description

Denso 221-9173 is engineered to match OE radiator specifications for the Nissan Frontier and Nissan Xterra. Denso supplies radiators to vehicle manufacturers worldwide, and this radiator reflects that OE-focused approach through controlled core dimensions, tank design, fin pitch, and material selection. The result is a radiator built for stable cooling performance and reliable fitment in demanding driving conditions. If you are replacing a worn or leaking radiator on a Frontier or Xterra, this part number 221-9173 provides the cooling capacity and transmission fluid cooling support needed for the application.

This part cross-references APDI 8012409 and Spectra Premium CU2409 for the same application.

What It Helps Address

• Engine overheating caused by a failing radiator core
• Coolant loss from cracks, leaks, or corrosion in the radiator assembly
• Transmission temperature concerns when the cooler circuit is part of the radiator
• Reduced cooling efficiency from restricted or damaged radiator passages
• Fitment issues when replacing an OE-style radiator on Frontier or Xterra models

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet size, and transmission cooler connections before installation. Flush the cooling system, inspect hoses and clamps, and confirm the fan shroud and mounting points are in good condition. After installation, refill with the correct coolant mixture and bleed air from the system according to Nissan service procedures.

Quality Assurance

Denso states that its radiators are built to OE standards and undergo durability and function testing before release. That manufacturing approach supports consistent performance, fitment, and long-term cooling reliability for Frontier and Xterra applications.