109°C (228°F) CPU temperature, fans idle @ 2k rpm!!!!!! I'M SO MAD

Tried a restore of Kernel Extensions
- AppleBlow,
- AppleFan,
- AppleK2Fan,
albeit I couldn't see any changes from my versions to the ones from the OS X Installer; made no difference...

Best regards,
Michael

same thing here. Fan's won't go faster than 2000rpm. Just had a 90°C. Tried resetting the PMU - at first i thought it helped, fans were about 2500rpm after i logged in to OS X, but when the CPU was cooled to 45°C, they stuck at 2000rpm again.

I think it began after i installed 10.5.6 update...

Hi Micheal, did you try a reformat?
Regards,
Darren

Yup. Fully confirmed here too. This could be the source of the crashes or freezes we may have been suffering, as the CPU is allowed to get way too hot. This is 100% reproducible, and I bet, if you follow the steps outlined by the OP, all unibody MBP will share the same results. Kinda worrying.I've reported it to Apple and hope to receive some feedback soon.

Coolbook is useless as it is registered to your specific laptop serial number and the vendor is too stingy to let you carry it across from one machine to another - I paid my money to him, and had numerous replacements and he refused to let me re-register even though I could prove I only had one machine at a time. He made me feel like a criminal, and therefore there's no way I'd recommend his software.

Hi, I'm having the same issue too... When I did the SMC reset everything went like it's suposed to (reaching 75-78ºC as max), but when I put the laptop to sleep and restarted it the CPU temp reached 95-100ºC (!!!) and the fans' speed still remained at 2000rpm, at this point (probably too late!) the fans started growing the speed very slooowly and after 3-4min the temp stabilizes at 80-82ºC at 4500rpm (while gaming Flat Out 2 demo).
Actually this is my second replaced Macbook Pro; first one had flickering screen, horitzontal flickering lines and dead pixels, second one with BSOD problem and third (and I supose the old two too) with the fans DIScontrol... I'm very disapointed, if this is a general issue of ALL the new unibody ones I'm going to go for a total refund of my money!!!!

Not yet; thought about formatting an external drive but will only have time for that in Jan-09...

Best,
Michael

Bug report's filed from my side, too.

Best regards,
Michael

i've tried resetting the SMC again, logged in to OS X - everything seemed to work fine. I've started playing Diablo 2 (gets the mac pretty hot) in window mode to see if fan control works and it worked great, keeping the temp not higher than 80°C. Then i closed D2 and went to the bathroom. Computer sleep has been disabled, there is only screensaver. And when i returned, i tried D2 again, and found out that fan cotrol no longer works, rpm is stuck at 2000 again. Played until temp 95°C and closed it, manually setting the RPM to 6k to cool things down.

I haven't got this problem until few days (dunno about "after sleep" one), i think it may be related to 10.5.6 update

I don't think it is related to the new 10.5.6 since I had the problem before hand.

i have exactly the same issue, as well as the "black screen of death" with games. if fans are the only thing preventing the CPU to reach 100°C then the fans/fans firmware are faulty. same kind of issue with the 9600 GPU. no one seems to have found a definitive explanation for all of this…
you people should try the apple hardware test, i did and got the following error (at 2d trial):
4SNS/1/40000000: TN0P-75.875

I think this is a widespread issue, and that it can be fixed by a simple firmware update. The SMC seems to lose its internal settings after:
1) sleeping the MBP
2) shutting down the MBP
3) resetting the MBP
4) logging out (or changing GPU)
and 5) with other tests ran by other users seem to happen even after a certain amount of time (screensaver)

I hope Apple would fix this very soon as many people are irritated of seeing their CPU's temperature climbing up to 110 degrees celcius, well beyong the maximum operating temperature of the T9400 and the T9600).

Also, just a point of concern, as the fans are not speeding up, EVERY component in the MBP is not getting cooled down, if the CPU rises to extreme temperatures, than the GPU, memory controller, RAM etc are all suffering from the intense heat as they share similar heatsinks and they are placed near each other. The fans are there for all of the system.

Please Apple fix this before Christmas, as a Christmas present for us concerned MacBook Pro users!

The Apple Hardware Test returned no errors for me.

My MBP (purchased early 2008) had horrible heat problems, and the fan was sometimes very noisy.

This same machine has needed the left USB port replaced twice (it just went dead for no reason) and the hard drive crashed about a month ago. The repair center's diagnosis: "Cosmic bad luck."

I wonder if the high heat didn't have something to do with both problems. Just throwing that out there for consideration.

By the way, in spite of these problems I really do like my Mac and am not likely to go back to a PC. I just wish tech support and pro-Mac folks would be less defensive about reported bugs/problems and instead take a "Hey, let's see what we can do to fix this" approach.

Some fine advice about heat:

http://discussions.apple.com/thread.jspa?threadID=716829&tstart=0