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Level 1

12 points

My late 2008 Macbook Pro is running hot with Mountain Lion

I've seen a few messages on here and on other sites about people's MBP's running about 5 to 10degC hotter after installing Mountain Lion.

I've had Mountain Lion for a good 5 days and I've seen no improvement. I've fixed permissions using Onyx, I've reset the PRAM and the SMC and I've also gone through all of my apps to update any that do not run on Mountain Lion.

No improvement.

As I sit here now and type, my MBP is running at 66degC and the fan is at 3000rpm.....I then use smc control to ramp the fan up to 6000rpm.....the temperature drops to around 62degC.....I then set the fanspeed to default. About 2 minutes later, the temperature increases and the fan automatically ramps up again to around 3000rpm. Ive also updated Adobe Flash.

I only have Transmission and Safari open - that's it. Nothing else.

Does anybody have any idea how to resolve this issue or do I need to hold tight and wait for Apple to acknowledge it and issue a corrective patch? Or simply, is it that my machine is on it's deathbed? It worked okay with Lion!

I am almost convinced that Apple are upgrading these new OSX in a way so that we all have to keep going out and buying new MBP's - this isn't going to happen. I will downgrade back to Lion, and then Snow Leopard, if I have to. I will get my full money's worth with this laptop, and then I might consider going back to Windows.....

Any suggestions would be appreciated.

Thanks

Macbook Pro, Mac OS X (10.5.8)

Posted on Aug 2, 2012 8:22 AM

19 replies

Aug 26, 2012 8:30 AM in response to taylord

I had a similar issue, my right fan would ramp up to full speed even though all temps were normal, with my 17" MacBook Pro which I though was related to a software update. It turned out to be a loose connector on the motherboard for the right fan.

I was lucky since unplugging the fan and plugging it back in fixed it. It's been working fine for over a year now. I read a defective fan can also cause this issue.

taylord

Level 1

1 points

Aug 26, 2012 11:38 AM in response to Stephen Spark

Yea i went in and lubed the axle of the fan, which was tip I saw on the web. I don't know if it fixed it, because I just forced SMC to run the fan up to 2805 RPM and it was still making a pretty nasty noise. But without me doing that, the computer is running ok right now.

At least now I'm confident I can open this computer up and replace the fan if I need to.

Nov 27, 2012 9:07 PM in response to Wilkyman76

I am having a similar issue with my MBP 2008 17" MacBookPro3,1. It has always run hot someone previously stated that's why it's a notebook, but now it's getting so hot that it is very uncomfortable to use it. The speaker casing is hot, the keyboard is warmer than all get out and no the palm rests too, I have tried everything and nothing works. any suggestions?

LBA78

Level 1

0 points

Jan 3, 2013 5:47 AM in response to Wilkyman76

I have similar problems with my MBP 15'' late 2008. According to my observations, there is a problem with the GPU switch: There is no difference in energy consumption, depending on the GPU that is active.

My guess: Since mountain lion both GPUs are always active (9400 and 9600).

If you change the GPU with gfxCardStatus there was a flickering before mountain lion. Since mountain lion the change is smooth.

My late 2008 Macbook Pro is running hot with Mountain Lion