hey guys, a while back before i replaced my engine my a/c was working fine, then when i had it replaced it didnt work any more. I never bothered with it becuz it was cold but now its very hot out and i need the a/c to work. Does anyone have any ideas what might the shop had did to male it stop working or is there anyway for me to check it out myself without another shops help. I went to autozone and refilled the 134 in it and it was already fulled. Could it be the compressor?