Fans Blowing full speed

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iMac Intel 27" EMC 2429

Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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My 27” iMac has suddenly started the fans full speed, full time, Apple Hardware test revealed the following code:

4SNS/1/C0000008 TGOH—124

So its a thermal sensor, but which one and is it changeable??

Many Thanks

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Dan @danj Rep: 479.8k Self employed contract worker 35 329 971 · Answer 1 · 2021-02-04T10:03:57-07:00

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You’ll need to take the MXM GPU board off clean the old thermal paste and pads refresh the paste and replacing the VRAM thermal pads

I would also recommend installing TG Pro so you can get a better handle on what your sensors and fans are doing.

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1 Comment:

Thanks @danj

Sounds like a fun packed job!! If the machine was a typical PC I wouldn’t hesitate, but I’m not sure I have the courage to open my iMac!!

I’ll order parts and let you know.

Thanks for the advice, much appreciated.

JC