13" aluminum unibody, 2.0 or 2.4 GHz Core 2 Duo processor.

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Why is my fan constantly running and losing wifi?

My fans just started running high all the time and my wifi signal keeps dropping. Also when the Macbook goes to sleep, it sometimes doesn't wake up. can anyone help with this? is this a hardware issue?

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Hi Joseph,

I've experienced this with my 2009 model recently. I explored all available options short of cutting holes into the bottom of the Macbook to channel more air through the vent. In this instance it turned out that Apple's thermal paste application was sloppy at best. This caused major overheating issues for me and would cause kernel panics whoever the Macbook reached temperatures that exceeded the maximum tolerable allowance. Fortunately the Macbook was designed to shutdown without causing damage.

It was necessary for me to open up the Macbook and remove the board and the cables very gently and apply thermal paste to the processor and the GPU chip.

Please see the guide below. After I completed the task (very carefully and gently) my Macbook has been running without the need to include a third party software to regulate the fan speed.

MacBook Unibody Model A1278 Heat Sink Replacement

The guide can be used to clean out the existing thermal paste and reapply it with a better quality and at the proper quantity. I would also use this opportunity to completely remove any dust from within the unit, including but not limited to the fan.

Please let me know how this turns out. I would love to hear the end result.



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Did this issue affect your wifi connection as well?


Not really. However you can attempt an SMC reset during a normal startup. Sometimes that's been known the reset the hardware settings and fix the issue.


Were you able to resolve the issue?


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I have the same issue on my Macbook 13 'mid 2010, fan running high all the time, sometimes wifi appears "No hardware installed", and when I do a restart it didn't boot again and I need to do a SMC and NVRAM reset. if I unplug the wifi connector the Macbook boots fine but fan run high. I tried replacacing thermal paste and didn't work.

I don't know what to do. Can someone help me?

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Joseph will be eternally grateful.
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