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JK 3.6 Cooling Upgrades and Improvements

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32K views 19 replies 11 participants last post by propes.reed May 4, 2024

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To improve cooling on a JK 3.6, consider these points: * **Radiator Upgrade:** The AFE Bladerunner GT radiator is a recommended option due to its bar and plate design offering more surface area. Be aware that some aftermarket aluminum radiators are prone to leaking due to flexing. * **Airflow:** Ensure adequate airflow to the radiator by removing any obstructions like grill mesh or auxiliary lights. An AEV hood can also improve airflow. * **Coolant Type:** Using the correct coolant is crucial. Some users have had success switching to green antifreeze. * **Thermostat:** Changing to a lower temperature thermostat (e.g., 180F) can help maintain lower coolant temperatures, but opinions vary on its effectiveness and potential side effects. Some report improved MPG with a lower temp thermostat. * **Fan Control:** The factory fan may not activate until a high temperature. Some suggest using an HP tuner to adjust fan activation points for earlier cooling. Mishimoto also offers a fan controller, but compatibility with newer JKs should be verified. * **Additional Cooling:** Consider a rail cooler for the oil or transmission, especially for automatic transmissions, to offload heat.

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propes.reed

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#20 · May 4, 2024

RIPP modifications makes a 180° thermostat for the wranglers now. And you could get someone to use an HP tuner to flash the fan(I believe they kick on 205 low speed and 215 high speed) to retune at 185/195. I also like TOTL Innovations hood. Mishimoto offers lifetime warranties on their products(including radiators and such). They also have trans coolers and oil coolers.

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