Mac Pro Tower - Which Fans Cool All of What?

So I have a 2008, 2.8 GHz 8-core Mac Pro tower.  I'm one of the many people who have problems with the fans.  In my case, I can get really high fan speeds, and the problem seems to be due to a faulty temperature sensor.  (Using iStat, it will sometimes show unreasonably high temps on a couple cores [or the heat sinks, apparently] immediately after turning it on, whether or not it's been off for awhile.  Sometimes, it will even show negative temperatures, in which case the fans will really go into overdrive.  Yes, I've already tried resetting the SMC and cleaning it out - nothing.)
What I've ended up doing so far is download Macs Fan Control and setting it to base the fan speeds off CPU temps that don't give faulty readings.  This works really well for lowering the fan speed (and thus noise), but I understand that different fans cool parts of the system besides just the CPU.  The fan names give basic descriptions, but not a lot of detail beyond that.  I've been trying to find a diagram showing which fans cool which parts of the system, but I mostly get results about fan noise, or minimalist diagrams that don't tell me all I want to know.  I'd like to make sure my settings are fairly optimal before I do anything intensive.
Can anyone help me with this?

I think you are "barking up the wrong tree".
The fans in the Mac Pro are controlled by Software in the System Management Controller. They make a feedback loop based on measured temperatures. If you are getting racing fans, that is probably based on Bad Temperature inputs. Fixing the temperature inputs is where you should place your energy. The fans are slaves in this process.
One possible exception: Most of the fans do have an RPM output indicator, which tells whether they are spinning properly. If the diagnostic indicates a MOT error, that is likely to be a Fan Motor that is not showing high RPMs at High speed settings, and may be defective. The power supply fans were designed by a different team, and may not have the same controls.
What SMC Fan Control and similar software allows you to do is put a new Floor under the fan speeds. They will spin faster at idle, and it is possible they may move up to even higher speeds more slowly. What is does NOT allow you to do is any actual reduction in minimum fan speeds, regardless of whether it allows you to set lower numbers.
When the numbers get extremely large, the magnitude bits overflow into what is sometimes considered the sign bit. That has no meaning in this context -- all numbers should be treated as positive numbers. That probably indicates they took a shortcut and used general-purpose routines for signed numbers that were lying around instead of writing more correct versions for positive numbers from scratch.

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