I'm sure this sounds way silly to everyone, but have you ensured that your aux fan is running? mine didn't and A/C would only blow warmish air. Everythiing else in the systme seemed ok. turned out to be a bad balast resitor to the aux. fan. Replace it for a few bucks and now the thing frezzes me out. But I'm sure you guys already covered that, just ignore me in that case.