I'm older than grit...so most likely experienced more fan clutches than the kid.... ;)
Fan clutch failures generally start to couple less and less
water pump shaft RPM's...till they almost free wheel
Since a failing unit still couples, there is enough air being pulled to take care of low demand...but...as the demand for more air goes up...it can not a accommodate...therefore the coolant can not reject enough BTU's and the engine heats up
Lowest cost component or system first, else tossing money away....till you get to that lower cost thing...
