Hot air blowing from the floor vents and no air blowing from dash vents

What is your question?

I have a 2017 ram 2500 Cummings big horn. Ive checked my cabin filter and compartment all seems fine . But I have no ac , I have ea air blowing from my floor vents bit nothing from my dash vents and when I try to click the ac buttons to bring air from out side instead of letting it circlet it just flash's at me. Please help!

What makes this problem better or worse?

When I turn it on.

How long has your 2017 Ram 2500 had this problem?

About a week.