i've always turned the a/c off before killing in every car i've ever had. then turn it on after starting. just a habit i was taught, supposedly making it easier on the next start. but the Z turns the a/c off every stinking time i turn it on when i do this. i start it, hit a/c it comes on for about 5 to 10 seconds then turns off, i turn it back on and it stays on. really annoying, it does it in fresh air or max/recirc mode. however i have noticed if i leave it on when i kill it, it starts then waits a couple seconds before kicking on. is it necessary to turn it off when you kill it, or does it start with the compressor off, then wait a bit then kick on?