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Q: how do i test the sensors and/or the ac control module on 2003 Volkswagen Beetle

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My ac compressor is turning on and the refrigerant is good (high pressure on the low side), but the air is hot, fans all working(tested high and low) and the exchanger is turning from hot to cold. When I run cold water on the condenser coil it turns the air cold. so i know the compressor is working at least.
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