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CPU overheating issue?

So I have this old Macbook from late 2009 from which it’s processor tends to heat up rather quickly when doing something small like watching a video or browsing the web in general. I have replaced the old paste for getting better thermal performance, but the results weren’t really that significant.

So my question is, is this a known issue with this old model? I am just a little bit worried, because on occasions, it tends to go up to nearly 80°C. CPU specs indicate that the max temp on the die is about 90°C, so it’s not that far off really.

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Install this great app TG Pro. You may need to email Matt (Tunabelly Software) to get the older version of OS-X.

It will allow you to see more clearly whats getting hot as well as your fans status. Post a snapshot of the main window here for us to see all of the sensors (you may need to enlarge the window to get it all) Ajout d'images à une question existante


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Possible heat sink liquid leakage. Look at the logic board where the crimped end on the heat sink is and see if you can discern an oily type of stain. If so replace the heat sink.

In any case I would replace the thermal paste as it may have degraded.

MacBook Unibody (A1342) Heat Sink

MacBook Unibody Model A1342 Heat Sink Replacement

Image MacBook Unibody (A1342) Heat Sink


MacBook Unibody (A1342) Heat Sink


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I actually have replaced the thermal paste just recently. I didn't notice any kind of oil stains as of yet, but I'll keep an eye on that if I ever get to disassembling the laptop. But, my main question wasn't really answered as in if this was an known issue with these old models.


@masterdelta - Just not possible to answer in the way you want.

Clearly your system is having problems. We just don't know whats causing it from the limited info we have so far.

Are you able to install TG Pro or run the built-in diagnostics? It might help,

Reformatting the drive and installing a fresh copy of MacOS might help.


I should have been a bit more specific on the details of what exactly I am using, for which I apologize.

The current OS I am using on it is MacOS Sierra. I've installed the monitor software you have mentioned, but so far the temperatures were relatively low then usual. I like to mention however that I've been using the Macs Fan Control software from Crystalidea. While I was still using that tool earlier today, I noticed my temperatures going up to at least 86.5°C when I was updating through the App Store.

To ensure I have more data, I am currently letting the monitor log the sensors that it is reading.

Just for the record, doubt a reinstall of MacOS is going to help much. I've done that already not that long ago and the results were pretty much the same.


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Applications/Utilities/Activity Monitor is a small App that lets you trace what’s happening in your Mac on software side. Open it when temperature ramps and see if anything is keeping the system busy with unwanted “all processes” to show up. It’s one of the latest generations C2D processors, pretty troublefree on its own, no special issues with it. If nothing keeps the CPU uselessly busy, there’s probably a hardware issue.

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