My wife's e320 blows hot air on the driver's side when the A/C is turned on. I figured the most likely culprit is an open and stuck valve. I removed the electrical connector from the duovalve and it still blows hot. Passenger side blow cold with the A/C on.

Have i diagnosed the problem correctly? Or could there be more wrong, like a stuck vacuum element? Or something more major wrong with the climate control

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