MacBook Fan doesn't stop!

connorxxl

macrumors newbie
Original poster
Mar 5, 2007
17
2
Hi all,

My macbook fan doesn't stop running on high power (6700rpm). I've checked this forum, and many other forums, but could not find an answer.
There is no process generating high CPU load (checked with iStat), and the macbook is on a normal desk. I've also made a SMC reset, without any improvement.
I thought about reinstalling Mac OS X, but the fan already starts when I switch the computer on, so not sure if it's the OS.

Can anyone help? It's really annoying to hear the fan running all the time.

Many thanks.

Chris
 

kolax

macrumors G3
Mar 20, 2007
9,186
115
Have you checked your temperatures?

Could be a dodgy temperature sensor thinking it is hotter than it really is.
 

connorxxl

macrumors newbie
Original poster
Mar 5, 2007
17
2
Hi,

thanks for helping me...

The temperatures shown in IStat are absolutely normal. Always around 40 C or below. And it happens all the time, no difference it batteries are charged or not.

Would be great if you have other ideas, it's really weird...

Chris
 

ScottDrummer

macrumors 6502
Jun 27, 2007
339
0
Canada
have you installed any fan control programs that allow you to amend fan speeds?
if so try getting rid of it, otherwise call applecare
I have an issue with fans going up when the charger is plugged in, I never had this issue before last week.
 

connorxxl

macrumors newbie
Original poster
Mar 5, 2007
17
2
I installed SMC fan control yesterday, to stop the fans, but the application didn't work (nothing changed). I don't have any other software installed...

And the fans start right after turning on the computer, before loading the OS...

I think my problem also started last week (not sure though)...

Thanks for your help.
 

AquaVita

macrumors newbie
Feb 1, 2007
25
0
I installed SMC fan control yesterday, to stop the fans, but the application didn't work (nothing changed). I don't have any other software installed...

And the fans start right after turning on the computer, before loading the OS...

I think my problem also started last week (not sure though)...

Thanks for your help.
pretty obvious to me that you have a failed thermostat/temp sensor. OSX has nothing to do with the issue, hence why they go full blast the minute you power on your machine

take it to the store, it needs service
 

mowlavie

macrumors member
Aug 6, 2007
36
0
macbook or not?

im getting scared , does all the macbooks heat up like this? if so, should i wait for the newer models to come out, help plz!!!:):):)
 

connorxxl

macrumors newbie
Original poster
Mar 5, 2007
17
2
Guys,

got an appointment on Friday at the Apple store here in London. Will let you know what the outcome is.

Thanks for your help!

Chris
 

connorxxl

macrumors newbie
Original poster
Mar 5, 2007
17
2
Update!

Went to the store last week, and when I started the MacBook... nothing! The fan had stopped!

So I went home again, started on the weekend again... very weird.

Will go back to the store when the fan runs again...

Annoying.

Thanks for your help.

Chris
 

BioChron

macrumors regular
Jun 13, 2006
102
0
Alaska
Update!

Went to the store last week, and when I started the MacBook... nothing! The fan had stopped!

So I went home again, started on the weekend again... very weird.

Will go back to the store when the fan runs again...

Annoying.

Thanks for your help.

Chris
Glad it worked out for you! :-D

- Daniel
 

ScottDrummer

macrumors 6502
Jun 27, 2007
339
0
Canada
there have been quite a few reports that prntjob manager runs and causes 100% cpu usage and therefore speed up of fans, worth checking out in activity monitor if it happens again.
 

withbatedbreath

macrumors newbie
Oct 17, 2006
3
0
Ok, I've installed the temperature moniter, and no setting seems to go above 65 C, and my CPU still has an idle of more than 70%, but the fan starts up. I'm actually starting to wonder if Firefox has anything to do with it, whenever I'm on a page with any kinds of advertisements it freaks out, even though the temperature is completely unaffected. The fan also always turns on when I'm on youtube. Anyone else?
 

lesliedow

macrumors newbie
Oct 3, 2007
1
0
Mine too

I have noticed that the fan on my MacBook also spins and CPU useage goes to 100% when firefox hits a site that has a lot of animation, flash etc. Quitting FF starts the fan slowing. This seems to be someting that has been worse in the past couple of months. I have had my computer since May of 06 and only now am seeing this problem. Its weird.
Leslie
 

doowrehs

macrumors regular
Oct 14, 2004
107
0
@withbatedbreath & lesliedow -

Don't worry: fans blasting away when viewing certain pages with Flash (esp. YouTube) is commonplace and widely acknowledged to be the result of Macromedia/Adobe's crappy port of Flash to the Mac OS. Your machines are both fine; it's Adobe's lazy engineers that are at fault.
 

newpcconvert

macrumors newbie
May 1, 2008
1
0
Had the same problem...it was the print job manager. Had a pending job in there that I deleted. Fan went from 6000rpm to 1000. Thanks everyone!
 

chrisitalianmag

macrumors newbie
Jul 16, 2008
1
0
How to stop the fan...

The fan runs because your SMC doesn't work properly anymore. Reset the Apple portable's System Management Controller (SMC) - all you have to do
for the MacBook Pro is

1. If the computer is on, turn it off.
2. Disconnect the AC Adapter and remove the computer's battery.
3. Press and hold down the power button for 5 seconds and then release the button.
4. Reconnect the battery and AC Adapter.
5. Press the Power button to restart the computer.

That's it! Your fan will stop and all the other little troubles you had in the last months will disappear. Over time, the settings in the System Management Controller may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, not charging the battery, or not recognizing the AC Adapter, among others. You don't need to reinstall Leopard as someone suggested above...Chris
 

im_noahselby

macrumors member
Nov 16, 2003
74
0
Canada
Yes. Deleting the job in the print queue stopped the problem. Thanks for the tip!
I had this same problem. I don't understand why this process would cause the fan to run full blast 24/7. For the last few days the fan sounded like a blow dryer constantly blowing air and on it's maximum setting.

As soon as I deleted the paused job in the print queue, the fan noise lowered instantly and has appeared to return back to normal.

Is this a glitch? Why does prntjob manager run and cause 100% cpu usage? It it really that intensive of a task?
 

mmnz

macrumors newbie
Dec 16, 2008
15
0
London
Found It

the problem is that if your fan starts gradually and then goes up to 6000 rpm and stays there until reboot, so there is process which is heating up the cpu, mine was the iantivirus which i installed, it was a free software and thus ceated that issue.

now its fine
 

Qbear

macrumors newbie
Aug 14, 2009
1
0
fan running

Same thing worked for me. My MB was running at around 77 degrees Celsius with the fan on constantly, but after I uninstalled my free antivirus the fan immediately turned off and my computer dropped 20 C. Crazy, but it worked!:D