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1.7 GHz dual-core Intel Processor (Turbo Boost up to 2.6 GHz) with 3 MB shared L3 cache

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Fan is weird, really weird

Fan sounds like the wind blowing in a B-rated 60s movie. Starts, stops, whirls, pauses, then starts again, runs for a while, stops for a few minutes, repeat cycle. CPU load doesn’t seem to have any connection to the behaviour.

So I replaced the fan and clean installed OSX - with no change. I also tried to monitor the fan and temp using a few of the available apps, and none of them seem to be able to read the RPM - it says 0 although that is clearly wrong. So it’s clearly a hardware issue, though not the fan itself.

What diagnostics could I try?

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As a professional I use

TG PRO

https://www.tunabellysoftware.com/tgpro/

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