HT202179: Learn about the fans in your Mac
Learn about Learn about the fans in your Mac
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All replies
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Helpful answers
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Feb 25, 2015 8:53 AM in response to Terry amby Grant Bennet-Alder,★HelpfulYour Mac uses measured temperatures to determine fan speed in a feedback loop.
Racing fans are an indication that your Mac is overheating, or a temperature sensor is not working properly. Replacing the fan will not fix the problem.
Your appointment for an evaluation at the genius Bar of an Apple store is free, in warranty or out. There is no obligation to have them do any work for a fee, but if you choose to, charges are generally flat rate for guaranteed repair, no surprises.
If you recently replaced components, such a RAM DIMMs, with parts that do not have Apple-approved temperature sensors, that can also cause such problems.
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Feb 25, 2015 9:29 AM in response to Grant Bennet-Alderby Terry am,Grant, Thanks. Sounds like my next move is to get it in for evaluation quickly before the fan dies. If it is indeed racing that will shorten the fan life. I replaced the Ram years ago so that is not likely the cause. When computer goes into sleep mode fan shuts off which makes me think it is not overheating. As you stated more likely a sensor. Anyway thanks again. Terry Molloy
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Feb 25, 2015 9:50 AM in response to Terry amby OGELTHORPE,An Apple Hardware Test may find the reason for the fan problem:
http://support.apple.com/en-us/HT201257
Note an error free AHT is not definitive.
Ciao.
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Feb 25, 2015 10:20 AM in response to Terry amby my ginger,Hi you could also do a SMC reset. But if this does not fix it you will still need to have it looked at. http://support.apple.com/en-us/HT201295