Flex-A-Lite 113757 Extruded Core Aluminum Radiator with Electric Fan System for 1999-2004 GM Full-Size 1/2-Ton Trucks and SUVs

The Flex-A-Lite 113757 is a direct-fit, performance aluminum radiator and electric fan combo engineered specifically for 1999–2004 full-size GM half-ton trucks and SUVs. This complete cooling system upgrade replaces the factory radiator and belt-driven engine fan with a more efficient, high-performance aluminum unit paired with a fully-shrouded electric fan system.

Extruded Core Technology is at the heart of this radiator's design. Unlike traditional multi-core radiators, Flex-A-Lite's extruded aluminum tubes maximize the contact area between coolant and the aluminum core, promoting superior heat rejection. Louver-patterned cooling fins further increase surface area and direct airflow precisely across the core for improved thermal performance.

Key Features:

• Direct-fit, bolt-on installation — no cutting or fabrication required
• Extruded core aluminum construction for better cooling, greater durability, and reduced weight compared to stock radiators
• Louver-cut cooling fins for increased surface area and optimized airflow
• Fully-shrouded electric fan system included
• Variable Speed Controller included — adjusts fan speed from 60–100% based on coolant temperature
• Eliminates parasitic power loss from belt-driven clutch fan
• Made in the USA by Flex-A-Lite

By eliminating the engine-driven clutch fan, this system recovers lost horsepower and torque while also improving fuel economy and reducing fan noise. The integrated electric fan and adjustable thermostatic controller make this a complete, ready-to-install cooling system upgrade. Flex-A-Lite is the original innovator of the automotive electric fan and continues to manufacture its products in the United States.