SSM 32308 - 2012-2013 C-Max/Focus/Fusion/MKZ Hybrid - Plug In Hybrid - Battery Electric Vehicles - A/C Compressor Noise - Low Refrigerant Charge Some 2012-2013 C-Max/Focus/Fusion/MKZ Hybrid/Plug In Hybrid and Battery Electric vehicles may exhibit excessive noise from the electric A/C compressor. A/C compressor noise in these vehicles may occur due to an incorrect refrigerant level or restriction in the system. Prior to following normal diagnostics for A/C compressor noise, check for refrigerant leaks and line restrictions. Repair as required per Workshop Manual, Section 412-00 then evaluate the system for noise. Typically, no additional service will be required after performing these repairs.