Denso 221-3254 Radiator

Denso 221-3254 Radiator for Honda Pilot and Ridgeline

The Denso 221-3254 radiator is built for direct-fit cooling system service on select Honda applications. It combines OE-style dimensions with an integrated transmission oil cooler to support stable engine temperature control and dependable heat exchange.

• Direct-fit radiator for select Honda Pilot and Honda Ridgeline applications
• Core height: 21.6250 in., core width: 30.1870 in., core thickness: 1.0600 in.
• Inlet diameter: 1.2500 in.; outlet diameter: 1.2500 in.
• Transmission oil cooler included
• Built to Denso OE standards for configuration, fitment, and durability
• Part number: 221-3254

OE-Style Cooling Performance

Denso supplies radiators to original equipment manufacturers worldwide, and the 221-3254 reflects that OE-focused engineering. Its tank design, fin pitch, core dimensions, and material selection are matched to rigid manufacturer standards to support proper engine cooling and consistent function. This radiator is a strong choice for Honda Pilot and Ridgeline owners looking for a replacement that follows the original cooling layout and transmission cooler setup.

This part cross-references Honda 19010-RN0-A51 and 19010-RN0-A52 for the same application.

Vehicle Fitment

• Fits 2009-2015 Honda Pilot, N/A
• Fits 2009-2014 Honda Ridgeline, N/A

Common Cooling System Issues It Can Address

• Overheating caused by a worn or leaking radiator
• Coolant loss from cracked tanks or damaged core passages
• Poor heat transfer from restricted or aging radiator fins
• Transmission fluid temperature concerns when the cooler circuit is part of the radiator assembly
• Fitment problems from using a non-OE-style replacement radiator

Installation Notes and Tips

Verify core dimensions, inlet and outlet size, and transmission cooler routing before installation. Flush the cooling system, inspect hoses and clamps, and confirm the radiator mounts securely in the factory location. After installation, refill with the correct coolant mixture and bleed air from the system according to Honda service procedures.

Quality Assurance

Denso radiators are manufactured to OE-level specifications and undergo durability and function testing before release. The 221-3254 is engineered to deliver reliable cooling performance under demanding driving conditions while maintaining the fitment expected for Honda Pilot and Honda Ridgeline service.