2009 f-350 6.4 clutch fan always on loud fan noise. I can turn the fan by hand, fan is not lock up. I disconnected the wire harness for the fan and I started it, the fan stay on about 5-10 second after no fan noise. I know its not the fan clutch it’s ok. I have a code P0337 crankshaft position sensor a circuit low input I erased three time but code P0337 keep reading out. Can anyone help! Thanks you!