The fans in my Yoga 13 are loud and they spin all the time. Is there anything I can do to change this?
Yes, with a caveat.
Lenovo has made available a special version of Yoga's Embedded Controller (EC) which contains an alternate thermal table for users who feel the fans are too loud. This alternate thermal table will delay the initial spin up of the fans, and will spin the fans up to a lower initial RPM than the default EC.
Caveat: While the fans will run less and at a lower RPM with this special EC, this means the system's operational temperature, and therefore surface temperatures, will be somewhat higher.
Below are links to download the special version EC with the alternate thermal table, and to download the default EC with the manufacturing default thermal table, so users may try the special EC, then revert back to the default if desired.
To appy either EC, you will need a USB key (flash drive) that can boot to DOS. The download files contain step by step instructions for applying the EC.
For advanced users: You will need to switch Boot Mode to Legacy to boot DOS, run EC.BAT, then switch back to UEFI after you have flashed the EC.
NOTE: If you have updated to the special version and experience issues with Intel Rapid Storage Technology, please update BIOS to version 55 or later. BIOS 55 may not also include the update to the EC which controls the fan, so updating to this BIOS without first updating from the first link above is unlikely to change fan operation.