My A/C would go off and on whenever it wanted. You could hear the compressor turn off and not come on again til after I started moving or whenever it wanted to. I had my mechanic fill the freon to specs. and I replaced the low pressure switch but still no luck. I started messing with the controls then I started tapping on the control panel and it turned the compressor on. I found that each time it turned off I would knock on it and it would turn on each time, so I had to replace the contol panel. now it works great.