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2016 Sonata Hybrid Ltd Ultimate (45k mi) | 2013 Elantra GLS (81k mi) | 2012 Elantra Limited (76k mi)
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On modern cars, the windshield defroster setting will automatically turn on the A/C to help with condensation removal. So even in winter when you are not running A/C for cooling the car, the compressor is being run whenever you are in defrost mode.

Also, most cars now have HVAC mode select buttons that cycle through the various settings (vent, vent/floor, floor, defrost/floor, etc.) so merely changing the settings thru these combinations will turn on your compressor if you pause long enough at the defrost mode.
 
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