Replacing a fan in 2009 Mac Pro

Studio K

macrumors 6502
Original poster
Feb 17, 2013
361
7
United States
Is it necessary to 'calibrate' a new fan if you need to replace one in the mac Pro?

Or.....are they simply 'plug and play'?

Does the SMC firmware automatcally take care of the fan speed for a new fan?

I would be using the correct fan, of course.

If calibration is needed, how to go about it? Apple Service Diagnostic, perhaps?
 
Last edited:

GP-SE

macrumors 6502
Feb 27, 2013
316
43
Is it necessary to 'calibrate' a new fan if you need to replace one in the mac Pro?

Or.....are they simply 'plug and play'?

Does the SMC firmware automatcally take care of the fan speed for a new fan?

I would be using the correct fan, of course.

If calibration is needed, how to go about it? Apple Service Diagnostic, perhaps?
if the new fan you buy has the same part# and is essentially the same fan, then just plug in and it should spin at the same speed as the old fan.
 

ScottishCaptain

macrumors 6502a
Oct 4, 2008
872
467
Is it necessary to 'calibrate' a new fan if you need to replace one in the mac Pro?
Nope.

Or.....are they simply 'plug and play'?
Yup.

Does the SMC firmware automatcally take care of the fan speed for a new fan?
There is only one proper replacement part number, and that is the part number you should be seeking to purchase. Any other part number (unless approved by Apple) may not work properly. The SMC assumes that you have the proper fan for your system installed, and as such when the SMC sets the fan speed a certain percentage, the fan tachometer sensor should read a certain number of RPMs. If the RPM is too high or too low for that speed, then the SMC will likely assume a fault and either shut down your computer or throttle up all the other fans.

I would be using the correct fan, of course.
Then you will have no problems. Just get the same part number you're replacing, unless Apple replaced that part number with a newer revision.

If calibration is needed, how to go about it? Apple Service Diagnostic, perhaps?
There is no calibration for the Intel machines, not even in ASD. The only thing ASD does is test to make sure the fan reaches maximum speed (by comparing the fan's speed at 100% to a built-in table of values), and that the rotor is turning (tach signal is greater then 0).

-SC
 
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jblagden

macrumors 65816
Aug 16, 2013
1,142
633
Is it necessary to 'calibrate' a new fan if you need to replace one in the mac Pro?

Or.....are they simply 'plug and play'?

Does the SMC firmware automatcally take care of the fan speed for a new fan?

I would be using the correct fan, of course.

If calibration is needed, how to go about it? Apple Service Diagnostic, perhaps?
Where did you buy it?