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2005 Blazer AC compressor cycling
My Blazer (4.3L) started cycling the AC compressor for no apparent reason. With climate controls and defrost off at idle I was hearing a click (compressor clutch engaging) and idle would jump 300rpm. It will cycle every 3 seconds on and off. My dealer saw it and says it isn't a problem, the compressor will just decide to come on for unknown reasons. He says as long as no dash lights come on it isn't a problem. I think they're idiots who have no idea how to troubleshoot the system. My warranty is up next month so any ideas on what might be causing this would be greatly appreciated!