I work on allot of diesels,autos,machinery at my house. But the Dodge like you have I have also. The vacuum line that comes off the air pump make sure the elbow isn't cracked. No air to the vents is because you have no vacuum pressure to the box or your selector knob and it defaults to the defrosters. When you turn the selector knob do you here anything like a slight air noise. You can remove the the controller from the dash to make sure the tubes running to it hasn't split or broke off from it. I have seen that happen to.
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Master Caterpillar Field Mechanic. “Retired”
2 minimally invasive spine surgerys L-3 threw S-1
3 360 3 level spinal fusions with all Titanium Hardware.
2 Spinal cord Stimulator surgerys with dual motor implants.