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there is a little electric motor located under the dash on the heater box it opens a little door in there that directs the air to the defroster, vents, under the dash etc. those are bad about going out.

If air flow is reduced when a/c is on- could be an incorrect refrigerant charge - causing the evaporator to "Freeze" When you shut of system evaporator has a chance to defrost restoring air flow. Try turn vent only on when air flow is reduced to see if evaporator defrosts and air flow restored

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Q: 2000 Chevy silverado heater and ac fan rusthen air flow drops off turning fan higher you can hear it speed up but no more air flow comes out turn it off and it starts all over again?
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