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no easy fix
replace the ac compressor or have an a c shop replace the ac shaft seal
both are not diy domain as it requires an accredited ac professional to do the job to get the ac working properly again
bypassing the compressor is best to do. get a belt for your engine less the ac option. the removal and tear down of any compressor is not easy for a novice
The pattern you describe is consistent with an alternator going bad. Maybe the fields are already rubbing together. Test it this way: Start the car and leave on idle, when the whine is worse, then start using up electricity, by increasing the demand. Turn on AC, then lights, then full blower and then high beams. If there is a change in the whine, then either alternator or voltage regulator is the culprit. When a compressor pulley bearing is bad, noise shifts just by turning AC on and off.
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