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I was thinking more of the restriction, and the fact that all of their waste heat was being blown past the primary radiator before the radiator even got a chance to cool off. the 10k cfm number that's been thrown out seems to be just a guess at the minimum it might be. It wouldn't surprise me...

As for the crunching numbers, at this point any numbers for the original cooling setup are worthless for comparing to your truck. That 10k+ cfm that cools everything right down doesn't compare to your vehicle as you've divorced all those systems that were being cooled together by that one fan...

Sorry, I don't do instagram. Okay, so you're saying you have a 185 degree thermostat. I'm seeing various thermostats sold under the part number in the manual for the 6.2l HMMWV as either a 170 opening/180 open or a 190 degree open depending on who is selling it. So the 185 isn't really a lower...

I think part of that is the lower thermostat (no idea when it opens, but I know these engines don't like being below about 190 or they start having issues). From all of this, I would assume it's something like a 165 degree thermostat or something like that that is fully open by 180 degrees...

the $200 fan is to assist the main fan, not to replace it. The two are not a direct comparison.

They started using pusher fans to help increase airflow on fully armored trucks being operated in the desert in combat conditions. As for airflow, the numbers I have seen is always in excess of 10k CFM for air movement. Not sure how an electric fan at half that, combined with a lower...

you keep saying a lower temp thermostat. These engines like to run hot. Putting in a lower thermostat is usually a bad thing, as it can lead to issues over time from the engine not being hot enough to burn efficiently, especially in cooler climates.

So what are the model and specs of this electric fan system?