Fan in G5 desktop runs too much

in Current Mac Hardware edited January 2014
I have a G5 Dual 2.7 desktop and the fan comes on at the slightest CPU usage (10-15%.)

I have opened Activity Monitor and the kernel_task runs about 5% CPU usage with 50 threads. Window Server runs about 5-6% with 3 threads. Open Safari or any other program and the fan takes off full tilt and then starts fluctuating fast, slow, etc. I've taken the cover off and cleaned the dust out with compressed air but that didn't seem to help much. I'm running 2 monitors and the window server will go up randomly as far as 15-20% then back down to 5%.

It just seems like the fan is running a lot more than it did when I first purchased my G5 2-3 years ago. Is this normal??

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