After 10 ys and 155kmiles, I took my trusty MB to the local MB for an AC recharge. I was told that both the high side and low side schraeder valves would not seal after the tech attempted to add freon, and both needed to be replaced at an estimated cost of >$200.

Is this a common failure mode?

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles