How many of you run your a/c with the recirculate button pushed in? I'm trying to figure out if my system needs recharging or if its just me. With my old '99 Sierra, the a/c in that made the cab a refrigerator---you basically had to wear a jacket with the a/c on and that was without the recirculate button pushed in. I rarely had to run the a/c on max with that button pushed in, unless it was like 90 degrees. With my Colorado, I have to run the a/c with the recirc button to really get the a/c to blow cold air. Anyone else have to do this?