For some reason on some T430 laptops, the fan is always on even if the CPU has a 0% load. If you are running Windows here are a few suggestions how you can fix this issue:
Make sure your laptop has the newest Bios installed - maybe Lenovo figured out how to resolve the Fan control at the hardware level.
- Run Lenovo - Update and Drivers
- Update Bios
Official Fan Speed Control Driver
- Download the driver from http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS001691
- Install the driver
- Restart the computer
- Open the Task manager and check if "FanSpeedControl.exe" is running (if not, de-install the driver again
Apparently "troubadix" from the German Uni-Marburg created a small program to control the ThinkPad Fan. Caution: As you are actively manipulating the fan speed, your hardware could overheat and be damaged which could not be
- Go to: http://www.staff.uni-marburg.de/~schmitzr/donate.html (yes - the webpage is in ComicSans)
- Scroll down to "download area" and select the "latest common Version" (or check if the special version is better suited for your laptop)
- Install and restart
- As a default, the fan is being controlled in the "Smart"-mode, based on the temperature of the CPU. I did not have to change any settings, usually, the CPU runs at around 42 degrees Celsius. If your CPU heats up faster you may want to use a more aggressive cooling strategy provided by the program.
- To minimize the window to the "Notification Area" Right-click on the TPFanControl icon in the Notification Area and disable "Show Window"