Fan is always running - very loud!

I've had this problem for several days and I'm at a loss. The fan on my Macbook is constantly running at a high speed, from the moment I turn it on until I turn it off. The computer does not feel hot, so I don't know why it's running so loudly.
I've reset the SMC and PRAM, and checked to make sure that there isn't an old print job in the printer queue - all the advice I've seen elsewhere online - and none of it has done any good.
According to iStat, the fan is going at 6200rpm, and the CPU temp is 45 degrees F.
Is there anything else I can try to calm the fan down? It's driving me crazy. Thanks for any help you can give me.

Correction - the temperature was in C. It's currently running at 111 degrees F! I can't figure out what's making it run so hot. I've seen elsewhere that I should check the Activity Monitor, but I have no idea what to look for there. Help?

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