Super noisy whiny fan

solrac

Mac Ninja
I'm on a macbook pro 2 ghz intel core duo, and my fan just recently started whining and making really loud noise.

I think it only happens when my 23" cinema display is plugged into it.

I know this is just a hardware part failure, since this never happened before.

There seems to be two fans (right and left). Here's one:
http://www.ifixit.com/MacBook-Parts/MacBook-Pro-15-Inch-Core-Duo-Left-Fan/IF185-023

I am ready to buy one of these now and install it. Question is... how do I find out which fan is faulty? My budget is VERY limited and I don't want to replace both if I don't have to.

Thanks!
 
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