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When you press auto, you're in "full auto". If you manually adjust any of the controls that are automatically controlled, then you deactivate the automatic control of that function, and you switch from "full auto" to "auto".
For exemple, if you touch the vents position button when in "full auto", then you become "auto", and the car doesn't control the vents position anymore. If you adjust the fan speed, then it stay at that speed, and the car doesn't control it anymore. Once there is nothing for the car to control, then the "auto" dissapear.
Appart from the fan speed, vent position there is also the AC and recirculation button that need to be "touched" for the air control to become full manual.
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