Hot computer... low fan speeds.

I saw a lot of questions here about fans running at full speech and being too loud. I have the opposite issue. I just moved into a new place, and I've had 3-4 freezes due to thermal issues. I have been monitoring the temp, and my processors get too hot. My A processor on my dual 2 gig G5 runs consistently in the 70s C. 76, I think, is the cut off temp.
I installed iStat pro which shows me my fan speeds. No matter how hot my computer gets, they stay at the same speed. The weirdest one is the rear fan which consistently stays at 51 RPM. The others hang out at 300... which isn't even close to max.
I don't think it's an isolated fan issue because it's all the fans and not just one. I don't think it's a sensor issue for the same reason.
Right now, i bought a fan and I have it blowing right into the front of the computer. My processors stay in the low 50s, so I know that if the fans were running properly, my computer would be plenty cool.
Does anyone have any idea why my fans aren't running right? And is there anything I can do to fix this myself?
Thanks,

I have cleaned out the inside... it is pretty much dust free. Would software cause the fans to not run correctly?
I don't have the hardware check disk... I don't think I ever got one. Or it got misplaced. I have the original install disk... but not a hardware check. Ah... it is on the install disk. I just had to read the instructions!
Just for fun, I'll install a fresh OS X on a spare disk to see if that works. It's an interesting idea.
Thanks for the responses... I'm just wondering why this is an isolated thing... a rear exhaust fan running at 51?
I'll also check for another utility, but when I open the side panel, and listen... it's easy to tell that the fans aren't working too hard.

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    I agree on tjk answer . To add my 2 cents:
    (2) : what is not said is that GPU shut down also the computer, but we didn't know at which temperature. It seem anyway that GPU is not designed to run at 90/100 ° C.
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    as fans are not the same on your computer than on mine, i can't give you the info, but mine have a red zone from 5000 rpm to 6000 rpm, which mean they run at their limits. it's an electrical limit, more than a rpm limit.
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    if the cpu can run to 100 °, is that the case for others electronics components ?
    more than 100 peoples on that forum have a ati x1600 gpu dying..
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    Quote
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