Most likely the refrigerant has reached a level low enough for the low pressure switch to activate, and thus causing disengagement of the compressor clutch. First, you would need to verify good power and ground accross the compressor clutch terminals, with the system operational, this will ellliminate possible clutch internal coil failure. You can use a generic automotive test lamp for this test. If there is no voltage present, the refrigerant level needs to be measured at a repair facility with an automotive a/c recycling machine. If approx. 1/2 pound the sytem will not operate, this low charge can be due to a small or large leak. A small leak can disapate 1 pound of refrigerant in over a year, so it very well could have been losing refrigerant the entire time and just coincidently stoped working after your recent usage. If the refrigerant level is good, another common failure is the a/c push button switch on the control panel. Push it in and out while the engine is running, and listen for the compressor kicking on, sometimes pushing it further in will help, if you hear the compressor try to come on at any point, this switch may be the problem.
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