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Technically speaking, an Air-conditioning system does not produce cold air, It absorbs heat (cold is an absence of heat).
By evaporating a liquid (Refrigerant) in the cars interior, heat is absorbed. The evaporated refrigerant is then transported to the engine compartment where after a pressure increase, it condenses.
During this condensation it rejects the stored heat (which was absorbed in the interior) After condensation, the liquid refrigerant travels to the interior compartment where, after a pressure drop, it evaporates.
Then the system starts to cycle all over again.
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