Denso 221-3121 Radiator

Overview of the Denso 221-3121 Radiator for Lexus GS300 and GS400

The Denso 221-3121 radiator is engineered specifically for Lexus GS300 and GS400 models, providing reliable cooling performance. Designed with precise core dimensions and integrated transmission oil cooler, this radiator supports optimal engine temperature management.

• Core Height: 15.812 inches
• Core Thickness: 0.625 inches
• Core Width: 29.437 inches
• Transmission Oil Cooler Included
• Inlet Diameter: 1.375 inches
• Outlet Diameter: 1.562 inches

Detailed Radiator Specifications and Features

This Denso radiator (part number 221-3121) features a core height of 15.812 inches, core thickness of 0.625 inches, and a core width of 29.437 inches, ensuring efficient heat dissipation for Lexus GS300 and GS400 vehicles. The inclusion of a transmission oil cooler enhances the cooling system by maintaining transmission fluid temperature, which is critical for transmission longevity and performance. The inlet and outlet diameters of 1.375 inches and 1.562 inches respectively are designed to match OEM specifications for proper coolant flow and system compatibility.

Applications and Common Issues Addressed

• Overheating engine due to radiator core damage or clogging
• Transmission fluid overheating affecting transmission performance
• Coolant leaks from worn or damaged radiator components
• Reduced cooling efficiency from corrosion or buildup inside the radiator
• Replacement for OEM radiator failures in Lexus GS300 and GS400

Installation Notes and Tips

When installing the Denso 221-3121 radiator, ensure all hose connections match the specified inlet and outlet diameters for a secure fit. Properly flush the cooling system before installation to prevent contamination. Verify the transmission oil cooler lines are correctly connected to maintain transmission cooling functionality. It is recommended to inspect all related components such as hoses, clamps, and thermostat during installation for optimal system performance.

Quality Assurance and Warranty Information

Denso radiators are manufactured to meet or exceed OEM standards for durability and performance. The 221-3121 radiator undergoes rigorous quality control to ensure reliable operation in Lexus GS300 and GS400 vehicles. Warranty coverage details should be confirmed at the point of purchase, typically including protection against manufacturing defects.