Check The Magnetic Clutch For A/C Compressor
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
Connect the connector battery to positive battery terminal in the A/C compressor, and then ground the battery (-) terminal to the A/C compressor itself. At this time, check that the magnetic clutch operating sound can be heard.