Defroster comes on while mode is set to floor/feet

Dwern

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Should the defrost come on (defrost button does not light up) while the mode is set to floor/feet? I can change the mode to show floor/feet only and then I can hear air start to come through the defrost vents and slightly through the front upper vents a few seconds later. If I press the mode button it shows it is on feet/floor with the defrost icon also. If I cycle again through the modes, I can hear the air stop coming through the defrost once the feet/floor mode is selected again. This does not have the defrost icon illuminated. Once again a few seconds later air starts coming through the defrost vents like before and will show the defrost icon along with floor/feet if the mode button is pressed. This happens at any temperature selected.
 
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