Denso 221-9477 Radiator

Reliable Radiator Replacement for Chevrolet and GMC Heavy-Duty Trucks

The Denso 221-9477 radiator is engineered to meet the cooling demands of Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD models. Designed with precise core dimensions and integrated transmission oil cooler, this radiator supports optimal engine performance under heavy-duty conditions.

• Core Height: 34.0551 inches
• Core Width: 23.9213 inches
• Core Thickness: 0.8661 inches
• Transmission Oil Cooler Included for enhanced cooling
• Inlet Diameter: 1.3125 inches
• Outlet Diameter: 1.5625 inches

Technical Details and Design Features

This Denso radiator (part number 221-9477) features a robust core designed to efficiently dissipate heat from the engine coolant. The core dimensions—34.0551 inches in height, 23.9213 inches in width, and 0.8661 inches in thickness—ensure sufficient surface area for heat exchange. The inclusion of a transmission oil cooler integrated within the radiator helps maintain transmission fluid temperature, which is critical for the durability and performance of heavy-duty Chevrolet and GMC trucks. The inlet and outlet diameters of 1.3125 inches and 1.5625 inches respectively are designed to match OEM specifications for proper coolant flow and system compatibility.

Compatible Vehicles and Applications

This radiator is compatible with the following models:

• Chevrolet Silverado 2500 HD
• Chevrolet Silverado 3500 HD
• GMC Sierra 2500 HD
• GMC Sierra 3500 HD

It is intended for use in heavy-duty truck cooling systems where reliable heat dissipation and transmission oil cooling are required.

Common Issues Addressed by This Radiator

• Engine overheating due to inefficient heat dissipation
• Transmission fluid overheating affecting transmission performance
• Coolant leaks from damaged or corroded radiator cores
• Reduced engine efficiency caused by clogged or worn radiators
• Incompatibility with OEM cooling system dimensions

Installation Notes and Tips

When installing the Denso 221-9477 radiator, ensure all hose connections match the specified inlet and outlet diameters for a secure fit. Verify that the transmission oil cooler lines are properly connected to maintain transmission fluid cooling. It is recommended to flush the cooling system before installation to prevent contamination. Use OEM or compatible mounting hardware to secure the radiator and avoid vibrations that could cause premature wear.

Quality Assurance and Warranty

Denso radiators are manufactured to meet strict quality standards and OEM specifications. The 221-9477 radiator undergoes rigorous testing to ensure durability and performance under heavy-duty conditions. While specific warranty details may vary, Denso products typically include coverage against manufacturing defects. Consult product documentation or authorized sources for exact warranty terms.