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Well the title is clear right? I ran the Apple Hardware Test (AHT) because our model was from 2012.

  • Switched off the macbook
  • power on macbook
  • press and hold ‘D’

I ran the extended and more advance test which takes a bit longer. But it gave me the message:

4mot/4/40000002: exhaust-0

it said that the fan was broken. It was exactly what I expected due to the noise of the fan.

Our model was an A1466 and the fan replacement would cost me 145 euro at an Apple care center, so I bought the part online for 26 euro.

Here is the step by step ifixit guide. Please note that you need a P5 pentalobe screwdriver which is Apple specific. I bought it online for 5 euro.

I have spend 38 euro inc shippingcosts. You can get the screwdriver really cheap from aliexpress, but the shipping takes a long time and I cannot live that long without my macbook. Same for the fan it seems. You can get both for 9 dollar without shipping costs but it will take a while to arrive.

 

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On the left is the new one, right side is the old one.

The hardest part was opening the zif connector to reattach the data kabel for the new fan.

 

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The zif connector is so small that it is hard to open.

Running the hardware diagnostics tool can confirm that replacing the fan is a succes. You will not get the 4mot/4/40000002 exhaust error again.

Good luck with the fan replacement!

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