Denso 221-9354 Radiator

Denso Auxiliary Radiator for BMW Cooling Systems

This Denso radiator is built for BMW charge air cooling applications that demand precise fitment and stable thermal control. Part number 221-9354 is engineered to match OE-style dimensions and cooling performance for select BMW 550i and 650i models.

Key Features

• Core height: 23.2300
• Core width: 12.1300
• Core thickness: 1.0600
• Inlet diameter: 0.6400
• Outlet diameter: 0.6400
• No transmission oil cooler included
• OE-based radiator configuration for consistent fitment

Detailed Description

Denso part number 221-9354 is an auxiliary radiator for BMW charge air cooling systems. It is built to OE standards for core dimensions, tank design, fin pitch, and materials, helping maintain the cooling performance required in turbocharged and high-output BMW applications. This radiator is a direct-fit solution for select BMW 550i and BMW 650i models, including 550i GT xDrive, 650i Gran Coupe, and xDrive variants listed in the fitment data. Denso’s OE supply experience supports accurate fitment and dependable thermal management under demanding driving conditions.

This part cross-references BMW 17117601832 and Spectra Premium CU13475 for the same application.

Vehicle Fitment

• Fits 2015-2017 BMW 550i GT xDrive, Auxiliary (Charge Air Cooling)
• Fits 2015-2017 BMW 650i, Auxiliary (Charge Air Cooling)
• Fits 2015-2017 BMW 650i Gran Coupe, Auxiliary (Charge Air Cooling)
• Fits 2015-2017 BMW 650i xDrive, Auxiliary (Charge Air Cooling)
• Fits 2015-2017 BMW 650i xDrive Gran Coupe, Auxiliary (Charge Air Cooling)
• Fits 2015-2016 BMW 550i, Auxiliary (Charge Air Cooling)
• Fits 2015-2016 BMW 550i xDrive, Auxiliary (Charge Air Cooling)
• Fits 2010-2015 BMW 550i GT, Auxiliary Radiator (Charge Air Cooling)
• Fits 2011-2014 BMW 550i, Auxiliary Radiator (Charge Air Cooling)
• Fits 2010-2014 BMW 550i GT xDrive, Auxiliary Radiator (Charge Air Cooling)
• Fits 2013-2014 BMW 550i xDrive, Auxiliary Radiator (Charge Air Cooling)
• Fits 2011 BMW 550i xDrive, Auxiliary Radiator (Charge Air Cooling)
• Fits 2012-2014 BMW 650i, Auxiliary Radiator (Charge Air Cooling)
• Fits 2013-2014 BMW 650i Gran Coupe, Auxiliary Radiator (Charge Air Cooling)
• Fits 2012-2014 BMW 650i xDrive, Auxiliary Radiator (Charge Air Cooling)
• Fits 2013-2014 BMW 650i xDrive Gran Coupe, Auxiliary Radiator (Charge Air Cooling)
• Fits 2012 BMW 550i xDrive, N/A

Common Cooling Issues Addressed

• Overheating in auxiliary charge air cooling circuits
• Reduced cooling efficiency in BMW turbocharged applications
• Leaks or damage in the auxiliary radiator assembly
• Fitment problems caused by incorrect core dimensions
• Cooling system performance loss from worn radiator components

Installation Notes and Tips

Verify the vehicle’s exact model, year, and cooling configuration before installation. Confirm inlet and outlet sizing, core dimensions, and the absence of a transmission oil cooler to match the original setup. For BMW 550i and BMW 650i applications, inspect related hoses, seals, and mounting points during replacement to ensure proper system sealing and airflow.

Quality Assurance

Denso supplies radiators to OE car makers worldwide, and this radiator is manufactured to meet rigid OE standards for durability and function. Each unit is tested for performance and reliability to support consistent cooling in demanding BMW applications.