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OnlyGerman

macrumors regular
Original poster
Jun 13, 2010
182
12
My late 2013 27inch iMac has been doing this for over a year but after a SMC reset and other basic prodcures, it would go away for a few months and return. Now it is permanent. The issue: fan is blowing at super full speed AND fan control shows a "0" value. Whenever it shows a value such as 1200 for example, everything is back to normal. iMac has not been opened and nothing is running to constitute the higher fan usage. Everything else runs fine. After the running diag, it said something about possible fan issue.

The weird part is that when this is happening (Fans at full speed), the fan speed shows 0. Could this really just be a faulty fan or sensor?
 
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