If it only cycles on and off then it is most likely low on freon. The pressure on both service ports need to be checked to be sure that this is the problem. the pressures should be 50 to 70 psi on the low side and about 225 to 275 psi on the high side.
Sounds like you have a vacuum leak in the condensor and maybe a problem with the evaporator. also your switch may be on its last leg too. also the clutch on your compressor sounds like it is needs to be replaced too. check system for shorts too.
Fig. 10: Vacuum diagram-1993 gasoline engines
Fig. 11: Vacuum diagram-1993 diesel engine
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