So I started noticing that the heater from my feet starts blowing by itself without me turning it on. This time I was idling for about an hour then started to drive. The heater was blowing from the feet/leg vents. Everything was off so not sure why it was happening. Any ideas from you guys???

 

I reckon that is just normal function when the HVAC is set to Auto (per the button on the dash). To test, turn Auto off (by pressing the button) and see what happens.

Edit - forgot to add - to adjust/set the air flow (which vents are open) with Auto off go into Climate via either the button on the side of the touch screen or the touch screen itself then select your vent(s).

 

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