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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Fan running constantly


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aggie97

 
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I have a Mac Pro running the most recent version of snow leopard. Recently I have noticed that my system's fan is running constantly. Is this a warning sign and something I need to be concerned about? If so, what steps should I take to determine if I have a problem. Thanks in advance for your suggestions and help.
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harryb2448

 
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The fans should run constantly, however if you can hear them loudly, go into System Preferences > Energy Saver > Options and make sure Processor Performance is set to Automatic. Running Apple Hardware Test will see if there are any hardware problems and a little widget iStat pro will keep an eye on temperature etc.
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VegasGeorge

 
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I wasn't aware that the fan ever turns completely off when the MBP is running. I had smcFanControl installed for several weeks, and I never noticed the fan in my MBP in an off condition.
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Quote:
Originally Posted by VegasGeorge View Post
I wasn't aware that the fan ever turns completely off when the MBP is running. I had smcFanControl installed for several weeks, and I never noticed the fan in my MBP in an off condition.
It doesn't turn off. It slows down to an idle of around 1800 RPM until such a time that the temperature sensors tell it to speed up to compensate for heat.

Regards.
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aggie97

 
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I really appreciate the advice harry. I downloaded istat pro and saw that my fan is actually running at 499 rpm. However, i still hear a loud humming noise coming from my tower. Do you have any suggestions as to which apple hardware test I should run to make sure my system is functioning properly? I just want to make sure everything is good and fix any problems that may be occurring.
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VegasGeorge

 
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Oh darn, I did it again! I keep reading Macbook Pro when someone posts Mac Pro. I must be dyslexic or something. Sorry!
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harryb2448

 
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Yes George and them MacBook things ain't REAL mens computers!

Just pop in disc one and run the extended test. Also open her up and make sure there are is no dust clogging the fans, particularly around the front leg air inlet. May also be the fans as there has been quite some comment on Mac Pro humming. Have a look at this link:-

http://discussions.apple.com/thread....readID=1971943
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