Sounds like Right Hand side fan noise

I've had my powerbook for over year now. I don't have the AppleCare. Ever so often I will hear a noise coming from the right side of my laptop. It doesn't seem hotter than usual. It doesn't happen all the time, but every now and then. I'm a bit concerned as I don't want my system burning up. Any suggestions of what it can be or how iIcan fix the issue?

The fan (fans) will come on once in awhile if the processor load is high. As long as its not too loud, just normal fan noise, what you are describing may be normal. When the fan runs take a look at the Activity Monitor to see what the processor load is.
A couple thing you could try if you are concerned...
Run Apple Hardware test included on the original OS DVD, Disk one. Insert the disk and reboot holding down the Option key. You will be presented with a menu, select "Apple Hardware Test" and follow the instructions. The long version of the test will test the fans, memory etc. When you insert the disk (before you re-boot) there should be an Apple Test Readme file in the finder.
Also... Download one of the temperature sensor utilities. Here's one:
http://www.bresink.com/osx/TemperatureMonitor.html
This will give you a look at the temperature of the Battery, Power supply, Processor and hard drive. There's also a widget or two on the Apple web site.
http://www.apple.com/downloads/dashboard/

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    ¯\_(ツ)_/¯

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