No heat 2014 Mazda 3

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2014 Mazda 3
I got into my car this morning and turned my heat on. It worked fine. I got back into it after work and tried to turn The ac on but it was blowing straight heat. I turned all controls off. And tried to start over. It then started blowing ice cold ac. Well now it will not turn back to heat. It is ice cold air no matter where the dial is set. I have no idea what is going on. Any help would be great full. And any info on where said part that is broken is located. I believe the heat is still working but maybe the actuator for the flap is broken. Help!! I
 
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