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Old Apr 18, 2011, 01:18 AM   #1
SimoneTemplar
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Macbook Pro - Fans running constantly

Hi there. My Macbook Pro's fans are constantly running. It only started maybe a month or so ago. I have reset my PRAM, I have cleaned up the hard drive and a verified disc permissions. The thermal paste on my cpu's has been replaced. I have looked in the acitivity monitor, and it the green and yellow lines are spiking, but I don't know why. I do not see any stray activities happening. I haven't upgraded my software, so the setup hasn't changed. Any ideas?
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Old Apr 18, 2011, 01:40 AM   #2
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what speed? it is always running at 2000
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Old Apr 18, 2011, 03:44 AM   #3
SimoneTemplar
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Macbook Pro Fan

How do I measure it? (Sorry if it's a dumb question).
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Old Apr 18, 2011, 03:48 AM   #4
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Have you tried an SMC reset yet?
Intel-based Macs: Resetting the System Management Controller (SMC)
To measure fan speed(s) and temperatures, use iStat Pro.
Btw, 2000RPM is the idle fan(s) speed.
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Old Apr 18, 2011, 03:49 AM   #5
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Originally Posted by SimoneTemplar View Post
How do I measure it? (Sorry if it's a dumb question).
iStat Pro is a good widget which will tell you

Theres also SMC Fancontrol, which used to allow you to control it, but i havent used it in a while and i dont know if it still works
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Old Apr 18, 2011, 03:54 AM   #6
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SMC work fine for me .


and did u mean that ur fans run constantly after u put ur mac to sleep ??
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Old Apr 18, 2011, 04:18 AM   #7
SimoneTemplar
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Macbook Pro Fans running constantly

Hi there. The fans are running at: Left: 6009rpm, Right: 5990rpm. I've done the SMC reset, nothing doing. And no, it's not when the Macbook is idle (asleep), but when I am working. Thanks for your responses.
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Old Apr 18, 2011, 04:21 AM   #8
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what are you doing when they run at 6000 rpm mark? heavy editing,or light browsing etc,give us more info pls,
you may need to try reinstall of osx at the worst,although id start with a hardware test,can use install disc for this,google it.apple support forum has it too,
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Old Apr 18, 2011, 04:28 AM   #9
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Macbook Pro Fans running constantly

It doesn't matter how many apps I'm running, it still runs at that speed. I will try reinstalling osx and give feedback.
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Old Apr 18, 2011, 04:55 AM   #10
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It doesn't matter how many apps I'm running, it still runs at that speed. I will try reinstalling osx and give feedback.
Considering your willing to do it i think reinstalling is probably a good idea
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Old Apr 18, 2011, 09:39 AM   #11
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Smile Macbook Pro Fans running constantly

I did the hardware test, and I got the following error:
4SNS/1/40000000:Th2H-128.00. I googled it and it seems to be the thermal sensor. Now to find myself a guru in SA that will fix it for me tomorrow (nearly impossible - normal quote time is 48 hours ), as in ASAP. Hold thumbs they have the part. Thanks for all your input. I really appreciate it. I learnt a lot.
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Old Apr 18, 2011, 09:45 AM   #12
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At what temperature do the fans start ramping up? Watching a flash video the CPU temps hit 80C, but the fans are still at 2000RPM.
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Old Apr 18, 2011, 11:51 AM   #13
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Macbook Pro Fans running constantly

The fans come on after about a minute after booting up cold. Temps are: 21 - HD, 37 - CPU, 20 - Airport, 21 - Enclosure base, 47 - GPU diode, 37 - GPU heatsink, 31 - Mem controller.
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Old Apr 18, 2011, 11:57 AM   #14
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yea that's definitely not normal. if you can, take it to Apple.
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Old Apr 18, 2011, 12:01 PM   #15
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Originally Posted by jambobowron View Post
iStat Pro is a good widget which will tell you

Theres also SMC Fancontrol, which used to allow you to control it, but i havent used it in a while and i dont know if it still works
I downloaded SMCFancontrol 2.2.2, but the application does't open. I am running OS 10.5.8.
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Old Apr 18, 2011, 12:02 PM   #16
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I downloaded SMCFancontrol 2.2.2, but the application does't open. I am running OS 10.5.8.
try Fan Control

much better than SMC in my opinion
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Old Apr 18, 2011, 12:14 PM   #17
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try Fan Control

much better than SMC in my opinion
I set the base speed to 1000RPM, Lower threshold to 40 degrees C and upper to 70 degrees C, and the fans are still churning. Am I doing it right?
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Old Apr 18, 2011, 12:18 PM   #18
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I set the base speed to 1000RPM, Lower threshold to 40 degrees C and upper to 70 degrees C, and the fans are still churning. Am I doing it right?
try my settings of 2700rpm fan speed, lower threshold of 45C, and upper threshold of 70C. that keeps my computer running at 30-40C when im just browsing and keeps it very silent.
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Old Apr 18, 2011, 12:33 PM   #19
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try my settings of 2700rpm fan speed, lower threshold of 45C, and upper threshold of 70C. that keeps my computer running at 30-40C when im just browsing and keeps it very silent.
No, still nothing. I found apple core in SA, and I will be at their doorstep first thing in the morning, while they are still having their morning coffee.
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Old Apr 18, 2011, 12:36 PM   #20
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No, still nothing. I found apple core in SA, and I will be at their doorstep first thing in the morning, while they are still having their morning coffee.
i know that was probably a typo when you typed Apple Core but in a way that would be a great name for their retail stores!! haha
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Old Apr 18, 2011, 12:38 PM   #21
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No, still nothing. I found apple core in SA, and I will be at their doorstep first thing in the morning, while they are still having their morning coffee.
If your thermal sensor isn't working the fans will run at full speed to protect the computer from overheating since it doesn't know if it is overheating.

A misconnected thermal sensor cable or the sensor itself may be bad, it's cheap to replace and apple should be able to do it for you in a day or two.No amount of software tweaking like fan control and smc fan control will change that, don't bother.
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Old Apr 18, 2011, 12:48 PM   #22
SimoneTemplar
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Macbook Pro Fan running constantly

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Originally Posted by snaky69 View Post
If your thermal sensor isn't working the fans will run at full speed to protect the computer from overheating since it doesn't know if it is overheating.

A misconnected thermal sensor cable or the sensor itself may be bad, it's cheap to replace and apple should be able to do it for you in a day or two.No amount of software tweaking like fan control and smc fan control will change that, don't bother.
That makes sense. Okiedokie. Thanks.
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Old Apr 18, 2011, 12:49 PM   #23
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i know that was probably a typo when you typed Apple Core but in a way that would be a great name for their retail stores!! haha
MWAHAHAHAHA!!! Ok, they are called "The Core Group", but it's obviously a pun on Apple. http://www.core.co.za/contact.php
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Old Apr 18, 2011, 12:50 PM   #24
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MWAHAHAHAHA!!! Ok, they are called "The Core Group", but it's obviously a pun on Apple. http://www.core.co.za/contact.php
oh i see haha. but i still think it'd be a great idea.
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Old Apr 20, 2011, 07:21 AM   #25
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Macbook Pro Fans running constantly

Just to keep you updated. I took it to the technicians, and they reckon I must have the Logic Board replaced (R6000 - donations welcome). They say that the guy that replaced the thermal paste, damaged it. "Report: Fails, 3 sensors, machine has been opened before, found a screw just sat inside on top of logic board. 1 sensor was not attached at all, just taped up with insulation tape, 1 sensor slightly broken near dvd drive and 1 sensor broken next to fan." Went back to thermal paste guy, who opened it up and explained that he doesn't know what they are talking about. I saw the tape, but apparantly it's for something that isn't needed. So here I am, dumb looking girl, in the middle, and someone is trying to con me out of R6000 and my fans are still running like it's the end of the world.
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