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Rattling/flow noise with AC on

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What causes a metallic rattling noise when AC is on ?
I had it once, in February, got refrigerant refilled, and it went away.
AC was not working one week ago
Tesla found a leak in evaporator, replaced it, two days later, same noise, and now,6 days after service, no more cooling.

Is this kind of noise a sign of low refrigerant amount ?