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This is caused by a loss of vacuum from the engine vacuum canister to the AC control switch, the canister is located under the hood, check the under hood vacuum diagram for exact location
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That's done on purpose to blow dried air at the windshield to help it defrost faster. When in defrost mode, the AC is running. Standard feature on most cars and trucks
If your front blower motor isn't working on any setting, could be the blower motor itself, the blower resistor, or sometimes the wire pigtail to either one could be the problem.
There are small doors within the heater/AC components located under the dash that direct the flow of air. Something has gone wrong with the operation of these doors.
I doubt this is a do-it-yourself project. Significant disassembly is required.
It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
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