there are a large variety of things that can prevent cold air blowing, especially on the SVX - like the air mix door positioning.
you've probably posted before so please excuse my poor memory. Have you run the on-board diagnostics? Have you done the obvious checks (like the 1st question to computer users is have they checked to make sure the power plug is connected to the computer and to the wall), i.e., are you sure the compressor is turning and not just the belt, etc.?
The best diagnostic is generally done with a gauge set, reading the high and low side pressures, at around 2k rpm. Without that I don't know if anyone could tell you if it was the compressor or some other component.
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