2004 Mercedes-Benz S430 Q&A

2004 Mercedes-Benz S430 Question: Is the AC system expansion valve a part of the evaporator?

The air stopped cooling but still blowed OK...no cool air. I was told that the expansion valve was defective. What does the expansin valve have to do the the evaporator? Is the expansion valve a part of the evaporator? -
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My AC stopped cooling but the blower works fine. I was told that the expansion valve was defective. Is that a part of the evaporator system?