Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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fan runs constantly.

I have the same problem. recently installed Fusion drive array and now the fan runs constantly. Last three digits are 66E. I have done numerous smc and pram resets. no luck.

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2.53 GHz Core 2 Duo (P8700)

Intro Date: June 8, 2009 Disc Date: April 13, 2010

Order No: MB991LL/A Model No: A1278 (EMC 2326*)

Subfamily: Mid-2009 13" Model ID: MacBookPro5,5

Std RAM: 4 GB Std VRAM: 256 MB

Std Storage: 250 GB (5400 RPM) Std Optical: 8X DL "SuperDrive"

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Check your reassembly - you may have missed connecting a sensor. (many problems fixed by finding connectors that "seemed" or "looked" square and complete but were loose, or not locked) .. you could run AHT expanded mode to see if you have a blown sensor.

Remember to return and mark accepted the answer that best solves your problem.

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