An air conditioning unit that has been overcharged with coolant, meaning that it has been overfilled with refrigerant, will not cool as effectively. The airflow may be weak and even warm. \
The excess of coolant makes everything work harder and run hotter. It will even make the air conditioner consume more energy. \
Too much of a good thing is way too much of a good thing in this case. An air conditioning system that has received too much refrigerant can cause damage to the compressor and other mechanical parts in the system. \