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The AC and heater are completely different subsystems.

The heater relies on heat generated by the engine and circulated by the engine coolant (radiator fluid) while the AC uses a belt driven compressor and separate fluids.

Their only normal commonalities are the blower motor (which you said works), the ducting and the control head.

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Q: What is wrong when the ac and heater stops working but the blower still blows?
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