Im thinking of changing my heater core, I smell a sweet smell (antifreeze) and my rad. seems to be losing 1/2 cup or so of fluid. None in the oil, etc. Anyways, i seen the tutorial that is posted in here at the home page tech section, it was well written, but my truck has working A/C, that tutorial didnt have A/C. Would it be the same instructions? Or is there more involved with A/C. Also if anyone has done a heater core could you tell me any tricks, secrets or anything that I may need to know and to make it a lil easier? Thanks, any help is appreciated.