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Does it sound like it is banging on something when it starts up, or is it just a loud vibration?
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Ok thank you. One more question if you would, please.
Is the vibration metalic sounding at all?
Ok unfortunatly the unit is probably just showing its age. You can check the isolator bushings on the compressors feet, but if they are ok then the compressor is just getting old.
Making sure that the unit is still level may help the noise some but probably wont solve all of the vibration.
It does sound like the unit is short cyceling though. Having the refrigerant checked by a service tech should solve that problem.
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