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there is an air pump, and it should make some noise... of course, if it sounds as a diesel engine, than something could be wrong, like the cushions that cancel vibration or internal mechanics... from your description it seems that you have all 4 corners auto leveling - regardless, it is normal for the pump to kick in when it is raising the car, and be silent when the air is released via valves...
how loud is rattle? does it wake up neighbors in the middle of night? or does it whisper loudly?
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