Denso 221-9390 Radiator

Denso 221-9390 Radiator for Mazda RX-8

The Denso 221-9390 radiator is built for 2004-2008 Mazda RX-8 applications and follows OE-style dimensions for proper cooling system fitment. With a 14.1700-inch core height, 26.1800-inch core width, and 0.9800-inch core thickness, it is sized to match the vehicle’s original radiator layout.

Denso’s OE supply experience is reflected in the radiator’s tank design, fin pitch, core dimensions, and material selection. This radiator does not include a transmission oil cooler, and it uses a 1.3750-inch inlet and 1.4000-inch outlet for direct cooling system connection.

Key Features

• Fits 2004-2008 Mazda RX-8
• Part number 221-9390
• OE-style radiator configuration for accurate fitment
• Core dimensions: 14.1700 in. height x 26.1800 in. width x 0.9800 in. thickness
• 1.3750 in. inlet diameter and 1.4000 in. outlet diameter
• No transmission oil cooler included
• Built to Denso’s OE standards for radiator performance and durability

Detailed Description

Denso 221-9390 is a replacement radiator for the Mazda RX-8 that focuses on correct fit, cooling efficiency, and dependable operation. It is engineered around OE specifications so the core size, tank layout, and connection points align with the factory cooling system. For drivers searching for a 2004 Mazda RX-8 radiator, 2005-2008 Mazda RX-8 cooling replacement, or a Denso 221-9390 radiator for Mazda RX-8 fitment, this unit matches the listed application directly.

This part cross-references Spectra Premium CU2694 and Reach Cooling 41-2694 for the same application.

Common Problems This Radiator Can Address

• Overheating caused by a leaking or restricted radiator
• Coolant loss from cracked tanks or damaged core passages
• Poor heat transfer from an aging factory radiator
• Fitment issues from non-OE-sized replacement parts
• Cooling system service needs on a Mazda RX-8 with worn radiator components

Installation Notes and Tips

Verify inlet and outlet hose sizes before installation and inspect the cooling system for debris, hose wear, and damaged clamps. Flush the system if contamination is present, and confirm that the radiator mounts and fan shroud alignment match the original setup. This radiator is listed for 2004-2008 Mazda RX-8, so confirm vehicle year before ordering.

Quality Assurance

Denso supplies radiators to OE vehicle manufacturers worldwide, and this part is produced to meet rigid OE standards for configuration, durability, and function. Each radiator is tested for performance and reliability under demanding operating conditions.