Home Repair Center Air Conditioner Repair Tips, DIY Help, and Information Common Questions about Air Conditioners (FAQs) Why does the air conditioner hum but not blow any cool air out?

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[Why isn't there any cold air even though the fan is running?]

If the unit is humming it may be that the fan motor or the compressor is seized, although a seized compressor will usually click or buzz. You will need to replace the faulty part.