It's called a "Fan Clutch"
Some are spring loaded, some are hydraulic.
they spin at engine speed when hot, allowing more air to be pulled.
otherwise, they spin somewhat freely with resistance.
If they spin freely (check with motor off), then they are bad. if you flick one, from the 12:00 position, it should go no further than 3 o'clock position.
Any auto parts store will have this, you do NOT need to waste money at the dealer.
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