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My guess is that, since you have a turbo system, the car isn't doing well with heat management. Maybe the intercooler is robbing the cooling air that the AC condenser needs. This would lead to heat soak in your refrigerant system .
The AC system does two things at once: it cools the incoming cabin air and dries it. Therefore, if the AC condenser isn't able to cool the refrigerant sufficiently, it would cause you to have cool, wet air hitting your windshield leading to fog.
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