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  1. I don’t understand how a faulty compressor or low refrigerant level could be the culprit of my blower speed randomly changing when the ac control is not set to AUTO.

    I have the system set to the lowest temp and the blower at maximum. The blower speed slows and increases randomly, but all the while the air being discharged remains cold.

    The air temp would certainly suffer if the problem was the compressor or low refrigerant. But how could either affect the blower speed if in manual mode (and not AUTO mode)?