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Reset fan behavior after 10.3.8 update System
After the 10.3.8 update, my iMac G5 (17") started to make a lot of noise. The fan was very much audible with only the Finder and no other application opened. Temperature readings appeared to be above normal in Temperature Monitor, but in the Activity monitor, nothing seemed to hog the processor.

I have also read about this same problem on several sites and, before starting the downgrade to 10.3.7 (after permissions repair, PRAM reset, OF reset etc), as several users recommended, I just tried to login as root. During the root session, the fan noise was equally elevated. I changed the settings in Energy Saver to "reduced processor speed," without making much difference in noise. Then I just logged back in my regular account, preparing myself for a backup and a reinstall.

Suddenly, fan noise started to decrease, and now my iMac G5 appears to be cured. I have no explanation for that, but I'm sure this is somthing related with permissions and system preferences. The strangest thing is that Temperature Monitor now shows values that are something like seven degrees Celsius lower than previously, under the same conditions of computer activity. Hope this helps.

[robg adds: I haven't heard of any issues with fan noise and the 10.3.8 update, and I can't verify that this fix works -- but I thought I'd run it and see if anyone else has any comments, one way or the other.]
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Reset fan behavior after 10.3.8 update
Authored by: junkiesxl on Mar 07, '05 03:04:05PM

The fan on my PB 12" rev a, did the same thing. It seems Apple has once again (like a couple of other updates) replaced the AppleADM103x.kext.

Replacing this with the AppleADM103x.kext from 10.2.8 solved the problem of my fan sounding like a plane.

Note: To get the original AppleADM103x.kext download Pacifist and 10.2.8 update from Apple. Then use pacifist to extract the .kext
It seems like Apple wants to be sure none of the PBs gets too hot, altough they launched like the hottie its is.



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Reset fan behavior after 10.3.8 update
Authored by: a-bort on Mar 08, '05 06:17:18AM
Yup, this is absolutely the way to do it (i got it from jackenhack) It makes my sweet PB 12inch 867Mhz running as it used to, long time ago..

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trouble replacing .kext
Authored by: sahnert on Mar 11, '05 03:43:02PM

I tried this and when I restarted it said the extension wasn't installed properly and can't be used. I'm afraid that means I don't have an extension to control the fan. I did save the original file from 10.3.8, but if I replace it won't it give me the same message? This is how I did it:
I dragged the old .kext file into the extensions folder and it said a newer version already exists. Replace? yes. Then it said you don't have permission. Authenticate? yes. Entered my password and it copied over I guess. Then I restarted today and it said that the extension was not properly installed and cannot be used. Is there a better way to do this?
For the record... I used the .kext from 10.2.3 rather than 10.2.8. Maybe that makes a difference?
let me know if you have an ideas. Thanks

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trouble replacing .kext
Authored by: johnsawyercjs on Mar 13, '05 02:48:38AM

I am about to display my relatively paltry knowledge of Unix--I have no idea if this will work, but give this a try in Terminal:

sudo touch /System/Library/Extensions

...then restart the Mac.

This is sometimes (always?) needed after you do the sort of extension moving you did, and also after trashing cache files (or just /System/Library/Extension.kextcache, /System/Library/Extensions.mkext, and /System/Library/Caches/com.apple.kernelcaches?) to reset the cache info.

Somebody set me straight if I'm imagining things.



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Reset fan behavior after 10.3.8 update
Authored by: atFault on Mar 07, '05 03:04:34PM

I'm sure Rob is very busy so not hearing about the fan problems with 10.3.8 is understandable. This hint may work, but all I did to make the fans go back to near normal on my Rev. A Dual 2.0 G5 was to change the Energy Saver > Options > Processor Performance: to Highest. For some reason the update changed it to Automatic and with that setting my fans are all over the place for simple tasks like scrolling web pages. Now back on Highest everything is at least acceptable in terms of fan noise, although I will admit that I don't believe it is the same as before the OS update.

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Let me through, let me through, I got here late.



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Reset fan behavior after 10.3.8 update
Authored by: pheed on Mar 07, '05 03:13:37PM

I have the same model Mac as you and I tried the same "fix." My complaint is that setting the processor performance to highest results in a quiet, but constant chirping of the power supply. So in my case, I have a trade off between a constant quiet noise or an intermittent very loud fan noise. I chose to put up with the fan noise until the next revision of the OS comes out.

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E-mail me: moc.cam@deehp



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Reset fan behavior after 10.3.8 update
Authored by: eagle on Mar 07, '05 03:42:24PM

Does anyone know of a way to fix this on an iMac G4? I have a 17" 1.25 GHz iMac G4 whose fan has been running for about a year. Even immediately after bootup, with nothing running on the machine, the fan is running.

Unfortunately, the iMac G4 does not have the "processor setting" option in Energy Saver, so that is not an option.



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Reset fan behavior after 10.3.8 update
Authored by: scotfl on Mar 07, '05 06:39:42PM

The iMac G4's fan always runs. You can't pack that much computer into that small a space without actively moving air through it. (The iMac G5s always have the fan on as well, but they run at greater range of fan speeds than the G4's).



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Reset fan behavior after 10.3.8 update
Authored by: eagle on Mar 07, '05 07:42:55PM

My iMac's fan didn't run constantly until some 10.3 update. Ever since then it runs 100% of the time. It used to run like my PowerBook - it used to only come on during periods of heavy CPU load.



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Reset fan behavior after 10.3.8 update
Authored by: kd4ttc on Nov 17, '05 10:01:39PM

No it didn't like it is now. The fan is multispeed. Mine used to be whisper quiet, only revving up under heavy processor load. Now it is on high most of the time. This is a definante change to the iMac behavior.

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Steve Holland



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Reset fan behavior after 10.3.8 update
Authored by: zemble on Mar 07, '05 04:30:08PM

I have a 2 month old PB15" and have noticed an increase in fan noise since the 10.3.8 update too. It's so noisy that if I'm on iChat Audio, the person at the other end can't hear me speak -- although, TBH, it's just a soft, annoying buzz at my end. I've also checked the Activity Monitor and there's no obvious culprits, although I thought for a while that quiting Safari, especially when I had a lot of tabs open, seemed to help.

If any one can track this one down it'd be appreciated. I'd like to fix it!



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Reset fan behavior after 10.3.8 update
Authored by: thinkyhead on Mar 07, '05 04:51:35PM

The problems I had with the fan have ceased. On my system after the update the system was pretty weird. Eventually I reset the PRAM and things came back to normal. But during one session I started in single-user mode and ran AppleJack. During that session the fan spun up to its highest level. Wow, like a jet engine. After that episode I reset the PRAM and all was well.

Every so often when I use XCode in distributed build mode I'll cancel a build but the "distccsched" process will suddenly go into a tight loop, hogging CPU and driving the temperature up. When this happens I just "sudo killall distccsched" and the processor cools off.

I keep my Energy Saver processor setting at "Automatic" with 10.3.8 despite the fact that I'm building software and might benefit from the extra clocks. The CPU runs about 20°F cooler (~160°F versus ~180°F) during builds, while the time-difference is really unnoticeable.

I don't know if the Automatic setting ever allows the processor load to ramp up to its maximum capacity. So far I've never had a situation in which so much extra processing was going on that the processor got back up to 190°. Maybe if there were more individual processes....

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| slur was here
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Temperatures
Authored by: Spiritman on Mar 07, '05 06:45:47PM

On my iMac G5 I'm running 128F Hard drive and CPU is 155Farenheit.....at what temperature does one get alarmed?

thanks



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Temperatures
Authored by: rawhead on Mar 07, '05 09:16:45PM

I think you get alarmed when it gets so hot that your Mac shuts itself down. Yes, modern Macs do that.

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All these moments will be lost in time
Like tears in rain.
Time to die.



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Temperatures
Authored by: rawhead on Mar 07, '05 09:18:37PM

What I meant to say was that you really don't need to worry about CPU temps, because your iMacG5 will shut itself down before the heat can do damage. Of course, if for no good reason your Mac starts shutting itself down constantly, then you'd want to take it in for repair.

---
All these moments will be lost in time
Like tears in rain.
Time to die.



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Reset fan behavior after 10.3.8 update
Authored by: Mars_Artis on Jun 30, '05 03:32:56AM

This issue is affecting even me on my Dual G5 2.0 after ugrading to 10.4.1
No apparent app causing the fan to speed up.
Tried to reset PRAM and unplugging the power chord. Nothing
Even playing with energy option performaces. Nothing.

Till I was on 10.3.9 verything was fine.
I'm wondering why i was so in rush for Tiger. I got a lot of issues on SMB networking, on printing, fan noise. Maybe something else....

Btw how to check which rev is my mac?



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Clean your machine
Authored by: kd4ttc on Mar 30, '06 06:59:23PM

I finally fixed my problem. I have had the fan noise problem on my iMac flat panel since the 10.4 install. By cleaning the vents the thing has gotten back to normal. I think that the new system had a different power curve vs fan setting and that my machine must have been marginal in heat clearance. I was afraid I would need to open the machine, but just vacuuming the top and bottom holes worked. I think I need to still open it up. I burned out a 10 year old power supply on a 6116CD a year and a half ago. Inspection showed dust on the air grates. Invisible until disassembled.

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Steve Holland



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