Denso 221-9254 Radiator

Denso Radiator for Audi S5 and RS5

Denso 221-9254 is an OE-style radiator built for direct-fit cooling performance in select Audi applications. It is engineered to match factory specifications for core size, tank design, fin pitch, and materials, helping maintain stable engine temperature under demanding driving conditions.

• Core height: 28.3500
• Core width: 19.4100
• Core thickness: 1.4200
• Inlet diameter: 1.5200
• Outlet diameter: 1.5200
• Transmission oil cooler included: yes
• OE-focused fitment and construction

OE Cooling Performance

This Denso radiator is built from the company’s OE supply experience and tested to meet strict durability and function standards. The radiator configuration is matched to factory requirements for cooling efficiency and fitment, making Denso 221-9254 a practical replacement for Audi S5 and Audi RS5 models that need dependable heat transfer and transmission cooling support.

This part cross-references Spectra Premium CU13174 for the same application.

Vehicle Fitment

• Fits 2013-2015 Audi RS5, N/A
• Fits 2008-2012 Audi S5, N/A

Common Cooling Issues It Can Address

• Engine overheating caused by a failing radiator core
• Coolant leaks from cracked or worn radiator tanks
• Reduced cooling efficiency from clogged or damaged internal passages
• Transmission temperature concerns when the integrated cooler is no longer performing properly
• Fitment problems from using a radiator that does not match OE dimensions

Installation Notes and Tips

Verify core height, width, thickness, and hose connection sizes before installation. Inspect hoses, clamps, and coolant condition during replacement, and flush the cooling system if contamination or debris is present. Confirm the transmission oil cooler connections are properly routed and sealed on vehicles equipped with automatic transmission cooling.

Quality Assurance

Denso radiators are built to OE standards and undergo durability and function testing before release. That manufacturing approach supports consistent cooling performance and fitment for Audi S5 and Audi RS5 applications.