Fan on fast and loud

I've seen this issue posted a few times with no firm answers, so...
My fan often runs very fast and loud....at those times I have noticed through the Activity Monitor (All Processes) something called "Quick Look Server" that has a listing of 98 to 99 in the CPU column; all of the other processes are in single digits.
When the fan is quiet, the Activity Monitor doesn't have the Quick Look Server anywhere near the 98-99 listing.
Any idea what the Quick Look Server does and whether it's the cause of the fan running loud and fast?
Steve
MacBook Mac OS X (10.5.5)

in the Activity Monitor, there's a drop-down menu, and if you select "All Process" it will list everything that's up and running, in order starting with whatever is using the most of the CPU. Most of it is internal to the system but it also includes whatever applications are open.
Whenever the fan is running high on my Macbook, the "Quick Look Server" is always at the top of the list, so I'd like to know what that is.
Steve

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