Why is my a/c blowing hot air when I put my a/c on? on 2001 Cadillac DeVille

Was installing a radio yesterday shortly after the air was blowing cold then all of a sudden it started blowing hot air the compressor is on but making funny noise the coolent is almost full

by in Potwin, KS on June 18, 2013
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1 answer
ANSWER by , June 18, 2013
COULD BE MANY ISSUES SEEK DIAG AND EST