Denso 221-3122 Radiator

Denso Radiator for Lexus LS400

This Denso radiator, part number 221-3122, is built for 1990-1995 Lexus LS400 applications and includes an integrated transmission oil cooler. It is a direct-fit cooling replacement for Lexus LS400 owners who need OE-style radiator dimensions, hose connections, and thermal performance.

Key Features

• OE-style radiator from Denso, a supplier to original equipment vehicle manufacturers
• Fits 1990-1995 Lexus LS400, with 1995 coverage noted through 10/94
• Transmission oil cooler included for automatic transmission cooling support
• Core dimensions: 15.7500 in. height, 29.437 in. width, 1.0000 in. thickness
• Inlet and outlet diameters: 1.5000 in.
• Built to match OE configuration, tank design, fin pitch, and materials standards

Product Details

Denso 221-3122 is engineered as a radiator replacement for the Lexus LS400 cooling system. The core size, inlet and outlet sizing, and integrated transmission oil cooler are specified to align with OE requirements, helping maintain proper engine temperature control and transmission fluid cooling. For drivers searching for a 1990-1995 Lexus LS400 radiator or a 1995 Lexus LS400 radiator with transmission cooler, this unit provides a direct replacement option backed by Denso’s OE manufacturing experience.

This part cross-references Spectra Premium CU1304 and CSF 2443 for the same application.

What It Helps Address

• Coolant leaks from a cracked or corroded radiator
• Overheating caused by reduced heat transfer efficiency
• Transmission fluid temperature issues tied to a failing cooler circuit
• Restricted coolant flow from internal buildup or damaged passages
• Fitment problems when replacing an aging Lexus LS400 radiator

Installation Notes and Tips

Verify hose connection size, core dimensions, and transmission cooler line routing before installation. Flush the cooling system, inspect hoses and clamps, and confirm the radiator cap and coolant condition are serviceable. After installation, refill with the correct coolant mixture and bleed air from the system according to Lexus service procedures.

Quality Assurance

Denso radiators are manufactured to OE-style standards and undergo durability and function testing before release. That focus on fitment, materials, and thermal performance supports dependable operation in demanding driving conditions.