More than likely the A/C pressure is low. Have you ever had the system serviced or flushed and filled?
Ill bet the system has leaked out the refrigerant or a portion of it and the a pressure switch wont reengage the clutch on the compressor as a fail safe device.
July, 19, 2012 AT 9:20 PM
Low state of charge will do that and a week ac clutch coil will to. When the clutch kicks out try taping the front of it lightly with a small hammer or a pry bar to see if it kicks back on. If yes the clutch is week.