HT204463: iMac: Fans run at full speed after computer turns on

Learn about iMac: Fans run at full speed after computer turns on

Martin Vipond

Level 1 (4 points)

Desktops

Q: Has anyone ever found a solution to resolve a continuous high fan speed issue on an iMac?

I administer 350 iMacs for a school system. Resetting the SMC has never worked even one time for me on at least a dozen machines. They end up going unused or they're shelved in a closet.

iMac, Mac OS X (10.4), Mid 2010 21" iMac

Posted on Jul 25, 2016 6:11 AM

I have this question too

Q: Has anyone ever found a solution to resolve a continuous high fan speed issue on an iMac?

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by Linc Davis,

Linc Davis Jul 25, 2016 6:24 AM in response to Martin Vipond
Level 10 (207,936 points)

Applications

Jul 25, 2016 6:24 AM in response to Martin Vipond

Apps can affect Mac performance, battery runtime, temperature, and fan activity - Apple Support
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by rkaufmann87,

rkaufmann87 Jul 25, 2016 6:28 AM in response to Martin Vipond
Level 9 (58,184 points)

Photos for Mac

Jul 25, 2016 6:28 AM in response to Martin Vipond

Please explain how you are doing the SMC reset and also sometimes it takes 2-3 times to work.
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by mattwithcats,

mattwithcats Jul 25, 2016 9:19 AM in response to Martin Vipond
Level 1 (40 points)

Desktops

Jul 25, 2016 9:19 AM in response to Martin Vipond

More info needed.

What model iMac, what processor, and size...

Have the hard drives been replaced?

My mid 2011 needed a temperature sensor added when I changed to a larger one, the OEM drive has the sensor built in...

Have you changed the coin battery?
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HT204463: iMac: Fans run at full speed after computer turns on

Q: Has anyone ever found a solution to resolve a continuous high fan speed issue on an iMac?

All replies Helpful answers

by Linc Davis,

by rkaufmann87,

by mattwithcats,

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