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EvenStranger

 
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Member Since: Dec 09, 2010
Location: Virginia
Posts: 845
EvenStranger is just really niceEvenStranger is just really niceEvenStranger is just really niceEvenStranger is just really niceEvenStranger is just really nice
Mac Specs: Currently 13" Late 2010 MBA, 4GB/128GB; Early 2011 13" MBP, dual core i7 2.7ghz, 4gb ram, 500gb hd

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It's possible a temperature sensor didn't get connected properly. If the Mac can't register a temperature sensor properly, it'll ramp up the fan full speed to keep things from burning out. If multiple components were replaced already, it's possible the technician missed moving a temperature sensor over to the new part. If the technician ran his hardware diagnostics following the repair, it should have caught that and failed.

If, however, it sounds as though something is hitting the fan blades, like a playing card in bicycle spokes, it could be a wire or a piece of tape catching the fan blades, which should be easy enough to slide out of the way.
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