The evaporator might look like a small radiator it uses freon from the compesssor routed to the condenser (front of radiator).
The gas is compressed producing heat, that heat is ciculated thru the condenser, when is is released it does the reverse and produces cold which is circulated thru the evaporator, and the process starts again at the compressor. I left out all the other devices such as dryer, safety switches, expansion valve, etc.