Clutch cycle switch 03 F 250 S/D

Where is this damn thing? I have been all over this thing and as best as I can tell it looks like it might be on the back of the compressor. Anybody else had any problems with this switch.I evacuated the system and checke refrigerant checked the high and low pressure switches and checked the clutch. This is my last ditch effort. The reason I am doing all this because the a/c will randomly kick off and randomly if at all come back on.Might take it a minute or it might take an hour. Absolutely no rhyme or reason.Happens under any conditions hot, cold, raining, dry, day, night. Any help will be really appreciated.