I have a 2005 f-150 with the 5.4 and the a/c compressor keeps cycling. I thought it was the high pressure switch but I changed it and still did it. I thought it was the clutch so I replaced the whole compressor cause I had to take it out anyway and it still does it:help. the system is full and has no leaks. It does it when the heat is on also. It does not do it when the a/c or heat is off. It is driving me nuts and I cant afford to have it worked on by the dealer. please any suggestions