| can be tested on the bench. A good AC man knows what part of the system can prevent the system from working. Pay him to methodically go thru each item. Even if you think its new or whatever. Because you've already gone to four shops, there could already be non-stock changes have been made. Try to find a shop or a tech who will take the time to go back to ground zero and start from scratch. Be sure he understands that you'll pay him for his time. Maybe begin by evacuating the system and break it down, checking fuses, testing independently high and low pressure switches, and replace with know good items the parts you can't test like the drier and/or expansion valve. When I did my LS swap, my car had a mixed bag of GM and Nissan sensors and harnesses. The AC guy I used, at first couldn't find some of the Nissan AC hardware, so he basically set up a stand alone system to run the HVAC in the car using sensors and parts that were lying on the fender or spliced into wires under the dash. It worked fine. Once he studied the Nissan system, he later went back and tied everything into the Nissan hardware under the dash... but my point is, that a good AC guy can get your system running in the car by isolating it from a defective Nissan sensor or whatever is safety checking a no-go. I would begin by checking out each item. Like Bernie noted, maybe the compressor oil was overfilled. Empty it and refill. I had a situation where the compressor clutch drew 16 amps and shorted out. It draws 3-4 amps with the new Nissan unit installed. Keep a running account of your efforts, including the parts you've already exchanged, or better yet have them doubled checked. Nothing worse than getting a bad replacement part. Its just a refrigerator in your car. Not rocket science. Good luck
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00:10:51 05/27/20
