Vacuum leak. This from another Forum -
The fix is most likely a vacuum leak (very common) or stuck blend door. Check out these threads.
How to fix heat / AC / air not blowing through center vents
Air won't come out of vents? Read this!
https://wranglertjforum.com/threads/...defrost.12541/
https://wranglertjforum.com/threads/...er-vents.2887/
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
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