I have a load noise from what sounds like the fan.  MBP 15" 2009

My MBP 15" makes a grinding sound that will go away and then come back.  If it is the fan, how difficult is this to have replaced?

13 screws. 10 for the bottom pan and 3 for the fan. Takes 3 screws longer than upgrading the RAM, with the advantage that the fan is not static-sensitive.
If one fan is bad, the other will follow shortly thereafter. Under warranty, Apple always changes both, you should follow suit. www.ifixit.com has the procedure and the parts you need.
For diagnosing if it IS the fan, use an Old Mechanic's Trick: get a short, thin metal rod. Place one end against the bony area right in front of your good ear. Place the other end against various spots on the Mac to determine the nature of the sound and its exact location. Use iFixIt's photos to see which component is the noisemaker: on the 15" MBP there are 4 candidates: 2 fans, one HDD and one optical drive. No other moving parts inside.

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    Instructions for the SMC reset are in https://discussions.apple.com/docs/DOC-3603

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  • My computer sounds like a fan what should i do?

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    Reset the SMC.
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    Before Resetting the SMC
    Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
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    Shut down the computer.
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