One Stop Solutions 2581 Radiator

Radiator for 2003-2009 Toyota 4Runner

Restore cooling performance with this OSC Premium New Automotive Radiator from One Stop Solutions. Part number 2581 is built for the 2003-2009 Toyota 4Runner and follows OES form and function for a direct-fit replacement radiator.

• Fits 2003-2009 Toyota 4Runner, N/A
• Crossflow radiator design with plastic tanks and a PA core material
• Core dimensions: 25 9/16 in. height, 23 5/16 in. width, 1-1/4 in. thickness
• 1 1/2 in. inlet and outlet diameters for OE-style hose connection sizing
• Transmission oil cooler included; engine oil cooler not included
• Individually pressure tested during production
• Die-cut gasket design helps maintain a leak-resistant seal
• Factory-spec fitment with fitted and torqued components

Detailed Product Overview

OSC part 2581 is engineered as a replacement radiator for the Toyota 4Runner, 2003-2009. It uses premium-grade aluminum construction with plastic tanks and a single-row core layout, along with plated transmission cooler passages where originally equipped. The design focuses on OE-style fit, cooling efficiency, and durability for high-mileage use. This radiator is also cross-referenced to APDI 8012581, Four Seasons 56623, Koyorad A2581, and Spectra Premium CU2581 for the same application.

For buyers searching for a 2003-2009 Toyota 4Runner radiator, 4Runner radiator replacement, or OSC 2581 radiator, this unit is built to match the original cooling system layout without changing the vehicle’s intended configuration.

Common Cooling Issues This Radiator Can Address

• Coolant leaks from a cracked or aging radiator tank
• Reduced cooling efficiency from clogged or weakened core passages
• Transmission fluid temperature concerns related to a failing cooler circuit
• Overheating caused by worn internal tubes, fins, or seals
• Fitment problems from a damaged or previously repaired radiator assembly

Installation Notes

Verify hose diameter, core size, and cooler line spacing before installation. Transfer any vehicle-specific connections as needed and inspect related hoses, clamps, and mounts for wear. Because this radiator is built for direct replacement use, it is suited to factory-style installation on the 2003-2009 Toyota 4Runner.

Quality Assurance

OSC radiators are produced with engineering updates aimed at improving cooling performance and service life. Each unit is tested during production, including cooler testing before tank installation, core testing before assembly, and a final assembled-unit test. Part number 2581 is built to meet OE-style cooler design requirements where originally equipped.