CSF Heavy-Duty All-Aluminum Radiator For 4Runner (1996-2002)

The 3rd Gen Toyota 4Runner has long been a favorite among off road enthusiasts, and even after more than 20 years, these SUVs are still seen everywhere from city streets to technical trails. While the legendary 3.4L platform is known for its reliability, aging supporting systems like the cooling system can benefit from an upgrade, especially once you add larger tires, armor, and push the vehicle harder than stock. That is exactly why CSF developed this Heavy Duty All Aluminum Radiator specifically for 1996–2002 4Runners. Designed to increase cooling capacity, improve durability, and handle the added stress of modified builds, this radiator is a true performance upgrade over the factory unit.

Important note

• Direct fit: True plug and play, drop in replacement with no trimming or cutting required.
• Transmission cooler: Built in heavy duty 5 plate transmission cooler connects to OEM lines.
• Fan shroud seal: Includes pre cut double sided adhesive foam strips to improve airflow efficiency.

Key features

• 2 row 42mm aluminum core: Increases coolant capacity and significantly improves heat dissipation.
• B Tube technology: CSF exclusive design increases heat transfer by approximately 15 percent over standard oval welded tubes.
• Multi louvered fins: Maximizes airflow through the core for improved cooling performance.
• All aluminum construction: High grade aluminum end tanks TIG welded to the core for superior strength and durability.
• Stronger than OEM: Eliminates the factory crimped plastic end tank weak point that is prone to failure over time.
• Upgraded transmission cooler: Heavy duty 5 plate internal cooler helps manage additional heat from towing, low range crawling, and oversized tires.

Why it matters for lifted and oversized tire builds

• Corrects heat buildup: Larger tires effectively reduce your gear ratio, forcing the engine and transmission to work harder.
• Handles added stress: Designed to manage the extra heat generated from crawling, towing, and modified setups.
• Improved long term reliability: Reinforced aluminum construction provides added confidence on and off the trail.

If you are building out a 3rd Gen 4Runner for serious trail use or simply want to future proof your cooling system, this CSF heavy duty radiator is a smart upgrade that keeps your rig running cool when it matters most.