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iMac fans rev randomly.

I

iDoiStuff

macrumors newbie
Original poster
Feb 11, 2011
17
0
Ontario, Canada
Why does my iMacs fans rev to maximum speed for a few seconds at random times? my iMac is running at 115f right now and it just did it, yet it will run at 170+ sometimes with the fans still at default 1000rpm.
 
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