Hello, I have a 2003 Mitsubishi Lancer ES w/ 150,000mi... yesterday on the way home from work, my AC went from cool to warm, fan was still blowing hard, but the air wasn't cool anymore. Went to AutoZone and bought stuff to recharge the AC. On the way back from AutoZone, I decided to turn the air on...surprise cold air! However, when I got stopped at a light, my rpms went way down, car studdered a little, and my oil pressure light started blinking. Turned the ac off and the the oil light stopped blinking, rpms went up... Still checked AC pressure when I got home, and it was in the green... Got online and someone with a similar problem said the ac/serpentine belt was the culprit. What do you think?

 

you have a bad expansion valve