I have a 2003 Lincoln Town Car. Recently, the a/c blows hot air for about 10-15 minutes before getting cool, not cold. I went to Pep Boys and they ran a diagnostic on it and said the pressures were good and go home and clean the condenser coils. That has not helped. I can see that the compressor clutch is not turning when I turn on the a/c even though the ambient temp is hot (live in AZ). Any ideas or suggestions (other than never returning to PepBoys)?