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The evaporator core is not allowing air to pass through it. Usually when that happens it's because it froze up due to a low freon charge, but sometimes it can be just badly plugged up from dirty air blowing through it.
If you run your heat for a few minutes, then switch to AC, will it blow any air regardless of temperature for any period of time? or does it immediately stop blowing air as soon as you switch from heat to AC?
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