Is it blowing hot on one side and cool on the other? Mine did this. I have the digital controls. There is a way to reset it if this is the case.
This is what I did to fix it.
Adjusted the passenger side to full hot and the drivers side to full cold and put the system in auto mode.
Then, turned off the ignition and turned it back on. In auto mode you will see the fan speed auto adjusting up and down.
Then, I reversed the settings, drivers full hot (90) and the passenger full cold (60). Put it in auto mode and turn off the ignition and then back on.