Replaced a/c compressor, evacuated and charged a/c, tested for leaks (found none), replaced a/c belt, replaced receiver dryer, replaced expansion valve, flushed a/c lines. I had cool air (not cold - about 60 degrees at vent) for about three days. Now the air is neither cool nor dry. With the a/c switched on at start up, I hear a squeal. Accelerating eliminates squeal and it doesn't return. Belt is tight. Everything seems to be right but, something isn't and I can't figure it out. Can anyone help me diagnose and fix this?