Compressor cycling frequently

71RALLYEDART said
I have a 71 Dart. I did a R134 a/c conversion on an original a/c car. The a/c compressor cycles about every 30 seconds. I had it checked by a few shops they drained the refrigerant checked for leaks and refilled it and I have the same issue. What should I be checking next? I also jumped the dryer switch and the issue continued. Any help would be greatly appreciated I’m stumped
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What kind of duty cycle are you expecting to see? 30 seconds doesn't really sound abnormal to me. Most of the R134a systems will engage the clutch for 5-15 seconds (depending on heat load, humidity ect) and then disengage for about 15-40 seconds until the pressure in the accumulator drops back down then the cycle starts over again. Is it blowing cold?