G5 Dual 2.0 Backside fan constantly racing

Details first - Dual 2.0Ghz PowerMac G5 7,3 PCI-X. I believe 'mid-2004' is the right name? I've had this machine since early 2007. It's running 10.5.8 and has 6.5GB of RAM installed.
This problem started rearing its head a few months ago -
At idle the backside fan would spin up from its usual 51rpm to around 150rpm then quiet back down after about 30 seconds to a minute. It would do this randomly every few hours.
This week the problem has escalated -
The backside fan spins at 51rpm right after the machine is rebooted. It assumes an 'idle' speed of 125-140rpm and never drops below this. Every five to ten minutes it ramps up to 200rpm and maintains this speed for about five more minutes before slowing back to the 125-140rpm range.
All other fans are spinning at their normal speeds - 300rpm for both processor fans and processor exhaust fans, 1000rpm for the drive bay fan, 104rpm for the expansion slots fan.
At idle with Safari idle and Activity Monitor active showing approximately 10% CPU utilization the temps are as follows -
CPU A - 34°C
CPU A Ambient - 58°C
CPU B - 55°C
CPU B Ambient - 39°C
Backside - 45°C
Drive Bay - 27°C
U3 Heatsink - 76°C
The fan speeds at the time of this reading were -
CPU A INTAKE - 300RPM
CPU A EXHAUST - 300RPM
CPU B INTAKE - 300RPM
CPU B EXHAUST - 300RPM
DRIVE BAY - 1000RPM
SLOT - 104RPM
BACKSIDE - 196RPM
The ambient room temperature is approximately 74°F (23°C), the machine has at least 9" of space to the left and rear. The right and front sides of the case are unobstructed. The air coming out of the rear of the drive bay is 30°C and the air coming from the processor exhaust fans is about 38°C. The surface temperature of the case itself is about 25°C. Those numbers probably aren't very important, I just want to establish that the room and the case itself are quite cool, despite the U3's readings!
Since I've been worried this was airflow-related I've thoroughly cleaned all the fans to include the backside fan, drive bay fan and the graphics card's onboard fan. No change in this behavior.
I blew out all the dust I could find with compressed air, quite a bit came out from the power supply section of the case!
I have reset the PRAM and the SMU twice. No change in this behavior.
I have not yet removed the logic board to examine the U3 heatsink, I've been trying to make that task a last resort as I've never fully disassembled this machine.
At this point I'm at a loss and I am open to any suggestions to correct this problem!

I left it iidle overnight (as I've done for the past six years) and the U3 Heatsink was sitting at 80, the Backside reading was 47 and the backside fan was spinning at 204RPM.
Is there any way to determine if a temp sensor has gone bad? Perhaps it's time to start pricing a replacement logic board.

Similar Messages

Cooling fans constantly run @ full speed after replacing the upper CPU??

After replacing the upper CPU on a Power Mac G5 (June 2004), Dual 1.8Ghz PowerPC, model M9454LL/A, all the cooling fans constantly run at full speed. All other operations are normal.
I've read, "...after replacing or switching CPU locations the Logic Board doesn't properly recognize the CPU's in their new location and a "Thermal Calibration" is needed". Could a "Thermal Calibration" possibly correct the constant full fan speed issue?
What software would be required?

Hi-
Could a "Thermal Calibration" possibly correct the constant full fan speed issue?
Yes.
What software would be required?
The Apple Service Diagnostic disc (ASD) of the proper version for your machine.
Call an authorized Apple service provider and arrange a calibration, as the disc is not readily available to individuals.

My MacBook Pro Retina freezes 30 seconds after Startup and the fan constantly makes noise. How do I fix this?

My MacBook Pro Retina freezes 30 seconds after Startup and the fan constantly makes noise. How do I fix this?

Have you tried:
http://support.apple.com/kb/ht1379
and
http://support.apple.com/kb/ht3964

My mid-2012 MacBook Pro has the fan constantly running. As soon as I turn it on. My MBP won't even be hot and the fan is running. How can I fix this?

My mid-2012 MacBook Pro has the fan constantly running. As soon as I turn it on. My MBP won't even be hot and the fan is running. How can I fix this?

If you are still under warranty and/or have AppleCare, call them. Let them deal w/it.
OOW try the following: http://support.apple.com/kb/HT1411 Apple Portables: Resetting the System Management Controller (SMC)

Fans CONSTANTLY running after installing Mavericks

So yeah - Fan constantly running after installing Mavericks.
NOT HARDWARE... tell me it is and ill lose my mind... I used to be an Apple Tech.
Erased and REINSTALLED Mountain Lion = RESOLVED
Reinstalled Mavericks = PERSISTS
REINSTALLED Mountain Lion = RESOLVED
--AWAITING OS FIX---
MACBOOK PRO 2009, 750GB HD, 8GB RAM

So yeah - Fan constantly running after installing Mavericks.
NOT HARDWARE... tell me it is and ill lose my mind... I used to be an Apple Tech.
Erased and REINSTALLED Mountain Lion = RESOLVED
Reinstalled Mavericks = PERSISTS
REINSTALLED Mountain Lion = RESOLVED
--AWAITING OS FIX---
MACBOOK PRO 2009, 750GB HD, 8GB RAM

Full fans constantly on

I currently have a problem with my mini. First of all it had 10.5 installed on it with no problems. I decided to upgrade to 10.6 which working fine. After a couple of days I did notice that the sound was grayed out. So I went to system preferences to check and I could not change anything. Okay fine that didn't really bother me until my Bluetooth now was grayed out a few days later. So today I tried to reset the PRAM (Command, Option, P, and R) which did nothing. Okay so then I decided to reset the PMU. This is were the problem started with the full fans constantly on and will not turn off. So I tried resetting it a few more time and it still stays on. Now I did notice that if I put the machine to sleep which it does turn off the fans but know the sleep light does turn on anymore. Any ideas before I call apple care as I really don't want to do a reinstall.
Thx

Since you have an Intel Mini, you should have applied the SMC reset procedure, rather than the PMU reset procedure (which is only for PPC Minis).
A known side-effect of wrongly applying the PMU procedure to an Intel Mini is that the fans will run full blast.
The only possible fix is to apply the correct SMC reset procedure -- though this will not always fix the problem, since it appears in some small number of cases that applying the PMU procedure does permanent damage to the logic board of the Intel Mini.
The SMC reset is described here:
http://support.apple.com/kb/HT1543

Fan constantly blowing on my iMac

Why is my fan constantly blowing on my imac

Now we know that the problem is caused by a process in OS X which is consuming all the CPU. This generates heat, that makes the fans work hard.
Open Activity Monitor, and choose "All Processes" in "Show" in the toolbar. Then, order the processes by CPU pressing the CPU button under the toolbar. Finally, telll us which processes are consuming more CPU

Satellite L650 - Fan constantly at 90%

I have a L650. My cooling fan constantly cools at 90%, exept if I turn on the computer after a standby, then the fan does start at all! So for me its either 90% or nothing!
I have the newest BIOS, so that not the problem, and changing power management settings doesn't help either
Anyone have any ideas or is it just sending the computer back for repairs? The damn thing is only 5 month old :(

Its all original toshiba software. All drivers are updated including BIOS and GPU. I know its possibly to change power settings in windows, but its changes nothing, its still fanning at 90%... Except after a standby session, then the fan doesn't start at all, causing warnings and overheating... All in all, it doesn't matter what the core temperatures are, it keeps cooling at high fan speed.
Message was edited by: mbfab

MBP Retina 15' fans constantly spinning up to 5k RPM

I recently got my new MBP 15' Retina with the following specs: 2.7 Core i7 with 16GB, 1600 MHz RAM. I use office for mac (outlook and powerpoint mostly) and a lot of Safari (1-2 windows, up to 7 tabs at most). I don't play any games on this machine, nor do I use high memory intensive apps like FinalCut and the like. I got Sophos anti virus running in the back, I occasionally use parallels with Win7 (very rarely) and other than that I virtually got no memory intensive programs running. Average temps according to iStat: 33-50
Yet my machine's fans constantly speed up to around 5k RPM (both fans) for about half a minute and then cycle back to ~2k RPM for about 10 minutes. This continues throughout the entire day.
I have the latest software version (10.8.2) and I already tried resetting SMC (shut down, adapater plugged in, Shift+Control+Option+Power button - release at once, start up). No difference. Still the same issue.
Ideas anyone?

2,000 rpm is the normal state for the fans - it's not high at all (mine can go up to 6,000+ rpms and I can hear them then).
Your fans are always going to be running and around 2,000 rpms is about as low as it gets.
Clinton

Loud Fans - Constantly - WHY? How do I make it stop?

I have a Mac Pro (2x2.66GHz Dual-Core Intel Xeon 8GB 667MHz DDR2). Unless the computer is OFF or "Sleeping" the fans are so loud, even when I am not using it. What causes this and is there a way to make it so that the fans are not constantly working? I notice after upgrading to Lion that when the screen saver starts up that the fans go double-time, so I've disabled my screen saver. Any suggestions/fixes? Thanks...
p.s. - it has been this way ever since I can remember (os upgrades make no change - aside from it goes to sleep on the first try with Lion, whereas before it would take 2,3,4,5 attempts to finally get it to sleep).

Run Activity Monitor and see what is maxing out your CPU for me the following fix did the trick
Hi,
if you don't want to use the terminal - there is a easy way to solve the CITRIX / Lion Problem (if you don't want to use it anymore):
1. deinstall Citrix (also deaktivate the plugin in firefox)
2. open finder
3. go to directory /Library/LaunchDaemons
4. delete com.citrix.agadminservice.plist
5. restart
Now the process should be away -- > and we have to wait for a Citrix LION Version
Thanks to the apple support! They helped me with this issue!

Fans Constantly Cycling On and Off

About a week ago the fans on my dual 2.0 G5 running 10.4.8 started cycling on and off. After a few days of this I ran AHT and received the following error:
Error Code 2STH/1/2:CPUA AD7417 AD1.
I found out this was a possible problem with the logic board and immediately took it in to the local Apple authorised repair center. They tested it and found a Thermometer failure on CPUA AD7417. They removed both processors, reset the logic board,reinstalled the processors, and completed calibration. After which they ran ADT test and Apple G5 Service test disk twice. According to them the G5 passed all the tests and had no problems.
After I got home and set it back up the fans started cycling on and off just as they did before I took it in for repairs–they cycle on and off regardless of the ambient temperature or the amount of work the processors are performing. I ran AHT's extended test which it passed with no problems.
What's going on? Did they mess up when they were doing the calibration? Am I going to have the same problems that prompted me to take it in for repairs to begin with? Is there a serious hardware problem that they failed to discover?
The service was poor, and they even managed to scratch the **** out of the side of my G5, so I don't really want to take it back to them again. Unfortunately the closest Apple Store is about 4 hours away and my G5 is no longer under warranty.
Any suggestions about what's causing the problem and what I should do would be really appreciated. Thanks.

Blinn–
Nope, I hadn't installed a software update. It just came out of nowhere. If you haven't done so, I reccommend running AHT to see what it shows. Hopefully you're just having a software problem.
DaddyPaycheck–
Thanks. That clears it up. I am definitely going to call Apple. I am really fuming about the lack of service I've had from the "Authorised Repair Center."
UPDATE
It just keeps getting worse. Now the G5's fans are really revving up and it is putting itself to sleep with increasing frequency. I just got off the phone with the guy who "repaired" it. The reason that AHT is showing the same error code, but on processor B is because when he reinstalled the processors after resetting the logic board he switched them. According to him, this error shows that it is a problem with processor B, which will need to be replaced. It's going to cost $581 for the CPU–no charge for labour since I've already paid to have it fixed once even though it wasn't!–but I don't think I want anyone at that shop working on it again.
Has anyone else replaced a CPU in a dual 2.0 G5? How much did it cost you? Is this something that I could do myself?
I think that before I do anything else I'm going to take DaddyPaycheck's advice and call Apple. At least then Apple will know that this authorised repair center is doing a terrible job!

IMac fan constantly running, I've tried everything!!

Hi,
I have a Mac (21.5-inch, Mid 2010)
Processor: 3.06 GHz Intel Core i3,
Memory: 4 GB 1333 MHz DDR3,
Graphics: ATI Radeon HD 4670 256 MB,
Running Yosemite 10.10.1
The fan is constantly running quite loud. I have never had this problem until recently and it seems to have started doing it for no apparent reason. I have changed any settings or done anything recently. In fact, the most recent change was upgrading to Yosemite.
I have tried doing a SMC reset (several times) which didn't change anything. I have tried lots of doing different ways of doing a Apple Hardware/Diagnostics Test and it told me that "The Apple Hardware Test is not compatible with this machine".
I have kept a close look at my Activity Monitor and nothing is spiking, average use is: System 2.75%, User 5.67%, Idle 90.4%
Using smcFanControl I know the fan is running at 29C and average 996rpm. I don't know if those stats are normal or not, but my fan is still making more noise than it ever has.
Please, can somebody help! I have been trying for weeks now with no success. I very worried that using my Mac is going to damage something and I desperately need it for work. Can anybody suggest anything outside of taking it to apple because that is my last resort which is going to cost me a lot of money
Thank you in advance for your help

The fans always run, that's normal. What's not normal is that you hear them as much as you do unless you use your imac in an EXTREMELY quiet environment. I think that 996rpm is actually lower than normal, you shouldn't hear that at all. Maybe you have a fan that's starting to fail and is making abnormal noise.
Running the Apple Hardware Test on your mac requires the original gray install discs that came with the computer when it was new, do you have those? AHT is on disc two, insert it and hold D at start up and AHT will start.

G5 Dual 1.8 GHz fans gradually go to full speed and stay there

My G5 Dual 1.8 GHz boots normally and quietly, with no freezes or panics. However, within a minute or so, I hear the fans begin to gradually gain speed. This continues for a couple of minutes until the fans reach maximum speed, making my room sound like a wind tunnel. This occurs with no programs running, just sitting idle at the Finder desktop.
I've checked the CPU & system temperatures using the shareware utility "Temperature Monitor 2.5" and everything is running cool, barely above room ambient, so there is no thermal reason for the fans to "take-off" like this as the heat pipes are doing their jobs to cool the CPUs.
There is no restriction on air flow around the case, and the acrylic side panel is installed. Interestingly, removing the side panel seems to have no effect on fan speed, whether installed or not ... maybe it's just the liquid cooled G5s, but isn't removing the side panel suppose to force the fans to full speed?
I was wondering if this out of control fan speed is a known issue that can be resolved with either a firmware update or software patch? Does this indicate the need for a thermal recalibration?

I've since answered my own question on this ... The reseller had installed OSX 10.3.2 as the boot OS. The (Late 2004) DP 1.8 GHz G5 requires 10.3.5 minimum, and with that update, the problem went away. The G5 now runs quietly.
This was far simpler than I had expected. Thanks.

IMac Fan constantly running OS X Yosemite Version 10.10.1 (14B25)

Does anyone have this problem my iMac is going to be about a 1 1/2 year old now and the fan is constantly running and never shuts off. This happened from day one took it back to Apple store when first notice the problem which was 1 week later. They told me it was nothing and all iMacs run the fan and do not get to much concern. He did something like unplugging the cord and pressing the power button 2 times holding down for 10 sec each time he said had to reset pram or something like that. It went away for a day and came back tried his procedure and works once or twice and back come on the fan all day. But when in sleep mode goes off. But when on you can feel the air out of back coming out. Is thee anyway to stop it someone told me maybe the motherboard was going or the ram was bad but the Apple tech was I think honest with me he said they have these issue's and there is really nothing to do with the fan noise.The computer is not hot at all to touch and he told me thats when I really have to worry then if it feels hot to touch then shut it down and wait till next day to turn back on. I do not know what to make out with this issue. Anyone know of a fix for this that I can do? There is nothing blocking the computer is wide open only have a cable modem on the side next to printer. I just want piece and quite again thats why I bought a Mac. My pc windows 7 never did this and my laptop never did this either never saw anything like this until I got my very first Mac. Little upset with Apple support they are useless and did not even offer me a new one when I went back a week later they were very rude to me I paid $1299.00 for nosey machine and no help.I am a very frustrated Mac user and thats why I do not own a Apple phone I like Android much better and cheaper than Apple products and from what I have read about the new phone software being so bad even with the updates that another reason I will never have a iPhone. So any help with my fan will be a great help sorry for venting on here.I do apologize for that but need to vent as my fan is driving me nuts. Thank you all

franick01 wrote:
Do you know of any free ones that I can keep that are good?
In a word no. I keep hoping for better low price offerings in the App store, but Marcel Bresink eschews the App Store and the relatively cheap temperature reporting apps I have found there do not report fan speed which in your case, and I suspect many, is critical. Be aware that due to manufacturing tolerances some fans are simply noisier than others.
For what it is worth the fan in my late 2012 Mac mini is currently spinning at around 4,700 RPM and I all I can here is a faint sound of moving air. I get more noise from the fan in my external HD/optical drive enclosure when burning a CD/DVD which of course generates a lot of heat.

Dual 1.8 PSU fan replacement

I have a dual 1.8 Powermac G5 that has one really loud fan (suspect bearing, not CFM noise). I tore down the PSU, blew out the dust bunnies and singled out the bad fan, the 2-wire one. I'd like to replace them both, but am not sure of a good replacement, anyone found one? Currently they are Superred 0.22A, CHA6012CBN-O-R and ...CBN-OA-R Any advice before I order some that are too high of an RPM or too low would be great.

You might take a look at the fans at this link for information. The 5000 RPM fan is about the correct power level. I haven't (and won't tonight) taken a look at how fast the fans are spinning on my "free range" supply when powered up. Unfortunately, I don't have access to a strobotach unit, so I would only be guessing anyway.
(Wow! I hadn't even thought about a strobotach unit in a long time, and it's been several decades since I actually used one, probably in a rotating machinery lab class in the seventies. A fun toy, though.)
You could also Google "60mm square DC fans" and see what you find.

G5 Dual 2.0 Backside fan constantly racing

Similar Messages

Maybe you are looking for