2005 Mercedes-Benz C230 Q&A

2005 Mercedes-Benz C230 Question: WHEN I TURN THE AC ON THE IDELING GOES DOWN LIKE ALMOST TURN OFF DOWN.

TOOK IT IN, THEY SAID NOT AIR COMPRESSOR. DON'T KNOW WHAT IS WRONG. IT DIDN'T DO IT WHEN I TOOK IT IN.. COULD IT BE A SENSOR? -
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