Fan Clutch 99 suburban C1500

[shultzee13]

99 C1500 suburban (Chevy)
When the vehicle is turned off the fan is very stiff and does not move freely. Turning by hand and letting go the fan moves about two blades in rotation and stops.

Is this fan supposed to turn freely or be stiff like that?

I only ask because the burb seams a little warmer from the AC when sitting still than it does running down the road.
Temp always stays the same. Never runs hot.

Thanks.