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When a car’s defrost mode is selected, the A.C. Is automatically engaged even when it is deselected or if heat is selected (you get heat and ac at the same time going to the windshield). This has been standard (at least in U.S. vehicles) for many years. The a.c. dehumidifies the air, thus aiding the clearing the inside of the windshield. Maybe try fan mode and be sure it is only passenger directed and not windshield directed to save energy.
 
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