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

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?

Asked by for the 2005 Mercedes-Benz C230
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