Radiator Fans - 4000 CFM

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Radiator Fans Parts or Accessories

Radiator Fans with 4000 CFM for serious cooling

Turn up the airflow with 4000 cfm to keep big-blocks, high-horsepower builds, and desert heat in check. If space is tight, shallow setups are available, and running them as a puller instead of a pusher delivers the best cooling capacity. High-output electric fans can tax a smaller alternator at idle, so consider your charging system, and a shroud that overlaps side tanks may have a slight effect yet still functions as designed.

Yes, use a dual-fan relay/harness and a thermostatic controller. This helps manage the higher amp load and cycles the fans at the right temp, which is especially helpful in very hot climates. If you're switching from a belt-driven flex fan, going electric can also free up a bit of horsepower.

Yes, 4000 CFM can handle serious heat. It's kept a 900 HP setup at 160 degrees after a 9 sec pass and helped a 454 run cool in desert conditions. Use it as a puller for the best cooling capacity. Make sure your radiator and shroud pairing suits your core size so airflow isn't restricted.

Plan for high current draw. Some dual setups draw 50 amps (25 amps per fan). An 85-amp alternator may deliver only about 40 amps at idle, which can drain the battery; a higher-output unit like 140 amps or a smaller alternator pulley can help. Also check battery age and condition.

Often, yes—just verify depth. Measure from the pulley to the radiator core and compare to the fan-and-shroud thickness. If space is tight, look for a low-profile assembly. If a shroud slightly overlaps the radiator side tanks, cooling effect may change a bit but the unit can still function as designed.