Fan Noise, is it a leopard thing?

Increasingly over the past 6 months my machine has been struggling well at least the fan seems to go 10 to the dozen and beach ball has become a far more regular friend than ever before.
I thought it was to do with the warm summer and the machine trying to stay cool, however its now autumn in scotland and way coool.
Do fans need replacing after a period of time?? if so is that a do at home job?
where can you buy them?
or is it a software thing. I have the older iMacG5 1.8Gb without a camera

A few suggestions:
Vacuum the dust bunnies off the fans
http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).
See if your model iMac is part of the G5 iMac Repair Programs
**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**

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