...yup u heard it here first..lol.......i have a 03 sunfire with ecotech and want to put ac in it..i have allready done the interior swap about 3hrs in total .....so the question is ..do i need to swap the engine wiring harness out of a ac car into mine and can i use one out of a cavalier?????...the interior wiring is all the same........I am a ac tech put 100% of the time i am dealing with factory wiring and i am doing this for myself so just looking for a point in the right direction......thanks...

Ummm, it should already have A/C. My 2003 cavalier is a 1sv base model(lowest/no options) and it has A/C. Im pretty sure it is a standard on all cars now.