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Sounds like a control transformer for the a/c unit. Will have to be replaced to stop the hum. For it to be a contactor/solenoid to be humming compressor would have to be running. It is not an expensive part but costly to get someone to change out for you. If you are capable of checking, I would go that route. Remove screws holding side panel at bottom, raise and remove electrical cover from a/c unit, transformer should be just inside. Transformers will operate for long time while making noise if you can stand it. Good luck!
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Ron & Libby Gordon
07 F350 Dually Ford Diesel
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