I have a 2008 Aveo LT. The A/C has been working great. I parked the car at the airport long term parking for nine days when I returned the A/C is blowing hot. The light on the Button in dash is green, fuses all look good, when you push the button to turn it on you can hear the compressor kick on, bought a new can of r134 and started to follow the instructions. It said to attach the hose/gauge to the low pressure connection. When I do that the gauge reads in the red section. The instructions said to stop and seek professional help if that happens. The gauge reads just under 100 when a/c turned on. If you turn it off it reads just over 100. Any guesses to what might be wrong?