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

Asked by for the 2001 Cadillac DeVille
1 answer
COULD BE MANY ISSUES SEEK DIAG AND EST