Why is there smoke coming out of my air vents in my car

The air conditioner's cooling cycle includes pulling in warm air that is then cooled. As a result of this process, condensation is produced. When moisture builds up in the heater box, it may eventually turn into vapor and get released with the cooled air, so you see white smoke coming from the air conditioner vents.

Vapor coming out of the AC vents in your car is usually the result of excess water that has built up inside the AC system. One possible cause is that the drain vent is plugged or water has built up in the heater box. In this situation, this water may condense and then be blown by the fan into the car.