1. Condensation. When warm, humid air comes into contact with the cold evaporator coil in your car's air conditioner, it condenses into water. This water is then drained out of the car through a condensate drain tube. If the drain tube is clogged, the water can back up and overflow, causing steam to come out of the vents.
2. Refrigerant leak. If there is a leak in the refrigerant lines, the refrigerant can escape and mix with the air in the system. This can cause the air to become humid, which can then condense into water and cause steam to come out of the vents.
3. Faulty evaporator core. The evaporator core is a part of the air conditioner that helps to cool the air. If the evaporator core is damaged or leaking, it can cause water to leak into the system and cause steam to come out of the vents.
If you see steam coming from your car's air conditioner, it is important to have it checked by a qualified mechanic to determine the cause and get it repaired.
