My laptop has tons of sensors: 2x ram temps, cpu-core0 cpu-core1, cpu-package-temp, graphics card temperature, ambient temperature (I think its ambient).. gosh its a lot.
For all I know 35C might be the ambient temp in your box or you ram temp...
In ubuntu only 4 of those sensors work (used to be two now its 4 with the newer 12.10).
I noticed an option in the acpi help:
Seeing you have an older system you may want to try that.
-p, --proc use old proc interface instead of new sys interface
Is this a desktop machine?