When I start the car with everything off, then hit the ac button, I can hear something engaging. Then if I hit the button to "off" then back to "on" , I can hear it engaging again. You mentioned both lines being hot , and the sure are hot , one a little less than the other . Like I said when I tried to charge it , it wouldn't take a drop. No condensation on lines at all. Like there was a blockage or something .