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Question: MacBook Pro (mid 2009) fans are loud and seem fast after a battery replacement

ive done both SMC and PRAM and still the same probalem. Please help.

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Did Apple replace the battery, or did a third-party or you? Whomever did the battery work likely damaged a sensor or sensor wire. When that happens the system mangement controller (SMC) sets fans to high to avoid heat damage.


You can try another SMC reset--sometime it require two:

How to reset the System Management Controller (SMC) on your Mac - Apple Support


If that reset does not restore the fans to normal speed (almost inaudible) then you need to run Apple Hardware Test using instructions in this articele:

How to use Apple Hardware Test on your Mac - Apple Support


It will give a code if it finds anything wrong.

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Nov 17, 2017 11:13 PM in response to swice30 In response to swice30

Did Apple replace the battery, or did a third-party or you? Whomever did the battery work likely damaged a sensor or sensor wire. When that happens the system mangement controller (SMC) sets fans to high to avoid heat damage.


You can try another SMC reset--sometime it require two:

How to reset the System Management Controller (SMC) on your Mac - Apple Support


If that reset does not restore the fans to normal speed (almost inaudible) then you need to run Apple Hardware Test using instructions in this articele:

How to use Apple Hardware Test on your Mac - Apple Support


It will give a code if it finds anything wrong.

Nov 17, 2017 11:13 PM

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Question: MacBook Pro (mid 2009) fans are loud and seem fast after a battery replacement