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Q: ac and heater wont blow air out of vent on 1999 Ford F-250 Super Duty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
can hear blower motor work but no air will come out of vents
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Question: does it blow out the defrost or floor? If it is just blowing out of the defrost, a vacuum leak may be the cause. Fords are designed so if a concern happens in the air distribution system, it defaults to defrost only. This vacuum leak could be under the hood or under the dash. Start looking where the vacuum source goes into the cab on the passenger side of the firewall.
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