Spectra Premium 2001-3559 Heavy Duty Aluminum Downflow Radiator for Navistar

The Spectra Premium 2001-3559 is a heavy-duty, all-aluminum replacement radiator engineered for the Navistar 5900i with MaxxForce 13. Built with innovative manufacturing technology and rigorous quality control, this radiator meets or exceeds the performance of the original equipment it replaces — including engine and transmission coolers.

Core Specifications:

• Core Material: Aluminum
• Tank Material: Aluminum
• Flow Type: Downflow
• Rows: 2
• Height: 38-1/2 in.
• Width: 41-9/16 in.
• Thickness: 2-3/16 in.
• Inlet Diameter: 2-1/2 in.
• Outlet Diameter: 2-1/2 in.
• Top of Core (TOC): 11-1/2 in.
• Grill Side: Front
• Radiator Frames: Not included

Key Features:

• OE-style clevis pins included (when required) to allow thermal expansion and proper movement within the frame
• Side rail stress relief cuts reduce stress on headers and accommodate thermal expansion
• Increased tube wall thickness for enhanced durability and long service life
• Redesigned corner brackets improve unit durability and simplify installation
• Every unit subjected to aging and endurance testing to validate performance under extreme weather conditions
• Proper hardware included for drop-in installation

What's Included:

• 1x Instruction Sheet
• 2x 90° Adaptors (Male 7/8-14 JIC to Male 7/8-14 ORB)
• 1x Spill-Proof Fitting (1/4-18 NPT)
• 1x Elbow (1/4-18 NPT)

The Spectra Premium 2001-3559 is 100% pressure-tested and packaged to ensure it arrives ready for installation, making it a reliable, direct-fit solution for heavy-duty truck cooling system replacement.