Greetings. Im using a dell vostro 1400 running Slackware 13.1 but i'm not able to use any fan control. Dellfand returns 'Fan 0 Status -1->0 Speed -1 CPU Temp -1C' and i8kctl works for some seconds only. Is there another way to set fan states?
Also i'm not able to reach fans via /proc/acpi/thermal_zone/
I've already loaded coretemp and i8k. Any ideas?

Anyone? :/

Make sure you have the modules 'processor' and 'thermal' and 'fan' inserted. Run 'modprobe' for each to insert them, then check again to see if the thermal zone exists.

Boot and run sensors-detect. It will preload certain modules at boot.
Be aware that acpi will handle the fan, if it's told to. There is a dir in /etc/acpi/events which uses pointers to scripts in /etc/acpi. That's kinda bare in slackware - fedora and debian do a decent pile of scripts you can snaffle and put in there and then link things up.
make sure acpid is running
chmod +x /etc/rc.d/rc.acpid
Hack the script and make it run acpid -l which logs events to syslog, then you can see what info is flying around.
If you have compiled your own kernel, go back to a stock one and see if that fixes it. I had this before with my first attempts at a kernel