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Ok. Sure is a big amp draw I'm surprised they didn't use variable frequency drives for the fans. Thanks
It is a mechanical fan on the engine controlled by a clutch. No electricity needed. It does take a lot of horsepower to turn it.
Thanks. I'm very surprised it's not twin electric fans or something. My 06 tundra had similar cooling to this.
That's the difference between a toyota and a real truck , No electric fan can keep up with cooling on a engine of this size and horsepower. I know the guys with the duramax's ( me included ) were always hoping tp find a large electric fan setup because of overheating while pulling trailers . But the few that tried failed miserably with electric after it got hot outside and they put a trailer behind it.
I would be curious to why you have a large amp draw like that if you really believe its coming from the fans since there mechanical ? Wonder if you have another issue ?
Nah that was me typing without thinking. I was equating power draw from the engine with amp draw. However thinking about how the noise matches RPM's, it can really only be what has been described by everyone. A clutch driven fan coupled to the engine.
Also I just assumed that a 2021 truck had electric fan motors...
By the way just like my duramax truck my cummins fan kicks in hard when its cold sometimes before it even needs any cooling . I called the manufacturer on the duramax and they said yes when fluid is cold in clutch fan sometimes for less then a minute it will kick in from fluid drag. So you might have a little of that going on also.
