The a/c in my Dodge Ram 5.2L seemed like it was not blowing cold air. I then had someone check it out. The system was not evacuated, but it was dye tested for leaks (none found), and then topped off with some new freon. Anyway, seems to be cooler than before, but still not cold enough for an 80+ degree day. Is there something else that needs to be checked or done so that it will produce colder air? Would evacuating the system make a difference?