Last year a mechanic charged my system, replaced a leaky valve, and it worked fine all summer here in Phoenix - though I was warned the squeal in the compressor might mean it was on its way out.� With the old compressor it cooled the inside of the van in about 15 min. down to a nice 75-78 degrees... so obviously something is not quite During the winter the freon leaked a bit so�I paid $800 for new compressor, dryer,�freon charge, and dye testing (the leak was the compressor seal not the o rings).� Now, all I get out the vent is 68 degrees which isn't enough to cool the big box.� Its going back in on Monday.�