I can't find *anything* to monitor temperature, fan speeds and so on. The closest I got was the "missing hard disk" ODM notification hack in the AIX LVM documentation. From what I gather, I might be out of luck, but I just find that a little hard to believe considering the cheapest PoS x86 Dell server is chock full of sensors...
Found this thread:
http://unix.derkeiler.com/Mailing-Lists ... 00020.html
In short, you cannot monitor these values. What I know is our current Power servers do an emergency shutdown when ambient temperature exceeds the permitted value, but I guess this action is internal to the system firmware.