UPDATE:

Indy replaced the Compressor again and it still has the same problem.
He suggested replacing the belt tensioner, still same problem.
He then suggests replacing the valve, still same problem.
Now he suggest replacing hose. I will find out later if this worked.
At this rate, I will have a new AC system. :-(

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2010 W212 E350 Sport
1996 W210 E320 (220K miles)