Denso 221-9420 Radiator

Denso Radiator for Mazda CX-9 Cooling Service

This Denso radiator, part number 221-9420, is built for direct-fit cooling service on select Mazda CX-9 models. It matches OE-style dimensions and includes an integrated transmission oil cooler for applications that require fluid temperature control.

Key Features

• Core height: 19.6900 in.
• Core width: 30.3700 in.
• Core thickness: 1.0600 in.
• Inlet diameter: 1.3750 in.
• Outlet diameter: 1.3800 in.
• Transmission oil cooler included: yes
• OE-based radiator configuration for fitment and cooling performance

Detailed Description

Denso part number 221-9420 is a radiator engineered to meet OE manufacturer standards for configuration, tank design, fin pitch, core dimensions, and materials. For Mazda CX-9 cooling system repair, this radiator supports proper engine temperature control while maintaining the fitment and function expected in factory-style replacement service. It is a strong match for drivers searching for a Mazda CX-9 radiator replacement with transmission cooler included.

This part cross-references APDI 8012986 for the same application. It fits 2010-2015 Mazda CX-9, N/A, w/ Towing Package, and fits 2007-2009 Mazda CX-9, N/A, w/ Towing Package and Heavy Duty Cooling.

What It Helps Address

• Overheating caused by a worn or leaking radiator
• Reduced cooling efficiency in high-load driving
• Transmission fluid temperature control concerns in equipped vehicles
• Coolant loss from cracked tanks or damaged core passages
• Fitment issues from an incorrect Mazda CX-9 replacement radiator

Installation Notes and Tips

Verify core dimensions, inlet and outlet sizes, and transmission cooler connections before installation. Confirm vehicle equipment, including towing package or heavy duty cooling, matches the listed application. Flush the cooling system, inspect hoses and clamps, and refill with the correct coolant mixture after installation.

Quality Assurance

Denso supplies radiators to OE car makers worldwide, and this radiator is built using OE-based specifications and durability testing to support reliable performance under demanding conditions.