When an air conditioning system is "overcharged," that means it has too much refrigerant. And like with all things, too much is just as bad as too little. \
When there is too much refrigerant, there will be more pressure in the condenser, and the air blowing inside from the unit might feel sticky or moist. Too much coolant can also cause subcooling, which makes the cool air far too cold. \
This subcooling can cause freezing in the coils and along the copper pipe, which will impede air flow and may even cause the system to shut off. The AC won’t work again and will not provide cool air again until the frozen parts unthaw. \