why does the A/C stop working and blowes hot air this last time it overheated

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why does the A/C stop working and blowes hot air this last time it overheated also and had to be picked up and brought to the dealership and they can not fix the problem this was the 3rd thime at the dealership on this they can not get it to do this for them and computer does not give any codes thank's Santa red van