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Freon is a refrigerant, or coolant, which helps your AC unit evaporate its internal heat and allows the air is expels to actually be cool. If you have sprung a Freon leak, you ll have to seal the problem area, replace the leaking substance, and replenish the amount of refrigerant in the system.. Your AC uses a refrigerant to pull the heat out of the air. After the transfer of heat, it is ready to go into the compressor. However, if the refrigerant is low or nonexistent, there is no transfer of heat. So, a recharge is merely a refilling of the refrigerant into the system..