How to manually speed up fan's speed in order to cool down hot G5's CPUs?

Hi everybody,
I recently was given an old 2x1.8Ghz PPC G5 in order to build a personnal server but I have troubleshooting with CPU's temps that are really too hot (75°C with no app open, only Finder).
I know these temps are not that "hot" but I can't imagine what it would be when I'll open Safari, iGetter, iTunes, CyberDuck, Adium and Photoshop CS4...).
I first unmount everything, blown inside some bottled air to make sure there were no dust creating overheating inside and remount everything.
Installed Leopard (last OS installable on PPC machines), made the last updates possible and restart.
Everything is working well althought this CPU's temp is so **** high and fans's speed are still at 300rpm. I was looking for some app that would do the same as SmcFanControl for Intel based Macs but for PPC's ones.
After many internet searches on many forums I finally admitted there were no software able to set fans's speed, the only way was manually editing the AppleFan.kext integer's values.
What I did, reducing the integer values to lower rates (256x multiples), then restarted the Mac but nothing happens. As I check the changed values, they indeed are the ones I edited but the fans still are at 300 rpm and the CPU's temp 75°C...
Does somebody have any solution for that issue, I feel I checked everything that was possible but nothing seems to work.
Any help is welcome...
Ygddrasill

I thought too that only Apple had these disks and I was told that it was quite hard to find them on the web...
Yes, normally only Apple or AASPs would have them, but they can be found.
I noticed that CPU A was 10°C hotter than the B, is that normal too as the computer is idling?
Sort of normal, with my Quad G5 not doing much I have 51.8°C, 50.3°C,46.2°C, 46.6°C, & as I recall die diffs were greater in 10.4 than 10.5.
Still, your temps are too high for idle, I would only expect those under full load for awhile.
I'd try Power Fractal on a long run & see if the temps increase or just stay where they are...
http://daugerresearch.com/fractals/powerfractal.shtml
is that a good sign of health for the fans?
I think so, but could you tell if the CPU fans were going full blast?

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