Did the old pump burn up or was it just the clutch? If it locked up or had a lot of damage it will fill the lines with debris. If so the engine system needs flushed and change the orfice tube.
also check your pressure readings on your high and low side. do you have rear air?
I had the same Problem, I had to get a switched installed (cheaper) to override the compressor system as with the computer system instead of paying a thousand dollars for new computer on my 03 gmc yukon...look at the recalls
it was like 50 bucks or something the computer isn't reading right I'm guessing ur problem is cause mine did the same thing after i replaced the compressor due to the clutch on the compressor was squealing...
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