Had the same issue with my G6E Turbo. After six trips to service they could not tell me what the issue was but by disconnecting the battery and re-setting, this would normally fix the issue. From what I understand, the battery they put in these cars is borderline power and if you go to start the car and it drops voltage, the car will turn of peripheral items, Air cond being one of them. If you drive the car, this puts power back into the battery and once you disconnect and re-start, this normally fixes it again. The best suggestion I have is get a Better battery with a higher CCA rating. this is what I did and problem seemed to be solved. At one point I was re-setting the climate control every couple of days. Will be interesting if the XR6 I picked up last week has the same issue.