hey guys, i have a 05 ctsv i just bought with 100k miles. love the car, i’ve been wanting one for a long time. only bad is that the ac doesn’t work. i always get the “service ac system” message. brought it to a guy at the shop who’s been all around it and we can’t find anything. topped the freon, replaced the high pressure switch and the pigtail for it, checked almost all of the wires... nothing. when he resets the code i’ll get ac for a couple of minutes then it kicks right back off. it’s winter in alabama right now so it’s not a big problem but i definitely need to figure something out before the summer when i’m burning alive in the black interior.