I was driving home tonight from BJ's and had some frozen stuff in back so pressed the "REAR" button at far right of controls in attempt to turn on air conditioning in the back. Panel lights up rear a/c with temp but has parenthesis around it. The button goes green so I assume A/C for rear is on, but after about 10 seconds, it cuts off. I tried several times and same thing happened each time. Didn't know if anyone has experience with this and understands what is going on?