Denso 221-3240 Radiator

Denso Radiator for Acura RL

Restore proper engine cooling with the Denso 221-3240 radiator, built for 2009-2012 Acura RL applications. This OE-style replacement is engineered around factory dimensions and cooling requirements for a direct-fit solution on the Acura RL.

Key Features

• Core height: 16.7500
• Core width: 27.9370
• Core thickness: 1.0600
• Inlet diameter: 1.2500
• Outlet diameter: 1.2500
• Transmission oil cooler included
• Part number: 221-3240

Built to OE Cooling Standards

Denso supplies radiators to original equipment vehicle manufacturers worldwide, and this radiator reflects that OE-focused engineering. The core dimensions, tank design, fin pitch, and materials are built to match factory requirements for the 2009-2012 Acura RL. Denso 221-3240 is designed for dependable heat transfer, stable coolant flow, and consistent fitment in the engine bay.

This part cross-references Acura (e.g., 19010-RKG-A51, 19010-RKG-A52) for the same application. It also serves as a direct replacement option for Acura RL radiator service where the original unit has aged, leaked, or lost cooling efficiency.

Common Problems This Radiator Can Address

• Coolant leaks from a cracked or corroded radiator core or tank
• Engine temperature rise during stop-and-go driving or highway use
• Reduced cooling performance from restricted internal passages
• Transmission fluid heat management concerns when the factory cooler is part of the system
• Fitment issues caused by using a non-OE-style replacement radiator

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet size, and transmission cooler connections before installation. Flush the cooling system, inspect hoses and clamps, and replace worn seals or related components as needed. After installation, refill with the correct coolant mixture and bleed air from the system according to factory service procedures.

Fits 2009-2012 Acura RL, N/A. Fits 2009-2012 Acura RL, N/A. Fits 2009-2012 Acura RL, N/A.

Quality Assurance

Denso radiators are manufactured to meet strict durability and function standards, with testing focused on reliable performance under demanding operating conditions. The 221-3240 is built to support OE-level fitment and cooling performance for Acura RL radiator replacement service.