To uninstall thinkfan just follow these instructions.
/debian/wheezy/main///install/index.html simple and lightweight fan control program Debian 7.0 misc 0.8.1-1
sudo apt-get remove thinkfan
Which will remove just the thinkfan package itself.
sudo apt-get remove --auto-remove thinkfan
This will remove the thinkfan package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for thinkfan then this will work.
sudo apt-get purge thinkfan
Or similarly, like this thinkfan
sudo apt-get purge --auto-remove thinkfan
|Description||simple and lightweight fan control program|