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check the and see if the condenser fan is running. you will find it if you take the top off also check and see if the condenser coil is clean. if it is dirty or the fan under the top is not running it will cause the compressor to short cycle on limits or overload.
Can you give me the model number of your AC unit. There should be a sticker on the bottom of the upper (roof) unit, that you can see when you take the filter down from the ceiling inside. Also need to know if it's a wall thermostat and what brand/model, or are the controls at the ceiling.
Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.