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your car should have a fresh air and a recirc setting.
if it does not blow much air in either setting then it is a plugged AC evap.
VERY common.
If you put fan on high, and it sounds the same in either fresh and recirc, then it is the flapper is stuck.
there is also a valve under the hood on the heater hoses which turns the coolant flow to the heater core on and off. I have seen plenty where the little wire comes off and it no longer moves according to the temp setting on the control panel.
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