OSX Fan Extension Mod: Applefan.kext does it work in 10.5x?

Question

I remember using this when tiger came out, then through the later updates of Tiger I could not get it to work.
Tried it with OS X 10.5X and don't notice it working.
Anyone have it working lately?
http://bitsandpieces.info/MDDFanExtensionMod.htm

Answer 1

Post # 204 has some insight:
http://forums.macrumors.com/showthre...=238961&page=9
Someone must know how to do this?
forums.macrumors.com/showthre...=238961&page=9 wrote:
PPC observations and request for collaboration+
I've spent the last week while playing round with this on my iBook G4, as I've always wished it would run a few degrees cooler.
A few things - the PPC Macs don't have a System Management Controller (SMC) so the smc utility won't work. The reason it won't run at all is that it appears to be built Intel-only. I've built it on PPC and it complains about a missing SMC, funnily-enough .
Having eliminated that option I went back to the AppleFan and AppleBlower kexts. Reviewing them and the OpenDarwin sources, I've come up with the basic process for fan control on Mac OS
1. The kernel communicates with the hardware (CPU) thermal sensors via AppleCPUThermo.kext.
2. The kernel looks up this temperature against the AppleFan.kext speed table. As Rokem found, this is indeed a range of temperatures multiplied by 256, which increase the fan speed by increasing the voltage incrementally (0.5v steps?) until the highest set temperature is reached, at which time the fan runs at maximum.
3. The kernel sets a new fan speed based on the lookup table.
4. The fan runs until the CPU temperature reaches the hysteresis-temp defined in AppleFan.kext, at which time the fan shuts down.
The default temperature range is 57-62 degrees celcius, and the hysteresis temp is 55, ie the fan comes on at increasing speeds up to 62 degrees, then cools the system to 55 and shuts off.
With this in mind I came up with a modified AppleFan.kext Info.plist with a range of 45-50, and a hysteresis temp of 42. However on regenerating the extension cache and rebooting, I found the same thing as Rokem, namely that these lower values had no effect, and that the fan runs the same as before.
Re-examining the AppleFan source, I found that the default values are hardcoded into the extension, and that it will use these if it cannot find an external source.+
My next step would be to rebuild AppleFan.kext with new values encoded, but I'd be interested to know what other peoples experiences have been on PPC, as I won't have a chance to do this for a wee while.