2000 V6 Mustang and my climate control unit stuck on Defrost

So I have a 2000 V6 Mustang and my climate control unit is stuck on the frost I have checked to see the vacuum lines and I have checked to see if there’s electrical or not I cannot figure out what to do can someone please help me figure this out
 
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Have you checked the tiny vacuum line that goes from the motor through the firewall? Is it connected? Is it damaged in the engine bay?

Give yourself the best shot at a "easy fix" and see if you can find a leak in this vacuum line. Because if the line is good, then the trouble shooting gets more involved.
 
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Have you checked the tiny vacuum line that goes from the motor through the firewall? Is it connected? Is it damaged in the engine bay?

Give yourself the best shot at a "easy fix" and see if you can find a leak in this vacuum line. Because if the line is good, then the trouble shooting gets more involved.


I haven’t been able to find my do you have a location I can check