OK, I'm at the point where I need to clear the oil out of the existing original compressor. What is the best way to do this without buying another expensive machine? How much of a pain is it to remove the serpentine belt and the compressor to drain the oil? Is it necesarry to drain the old mineral oil out of the compressor or will 134a run fine with it? If it will run fine with the mineral oil in the compressor, do I have to add additional oil with the refrigerant when I put it in? Another couple of questions?
I notice that the line containing the orifice tube (after I replaced the tube with a new one) only seems to screw back to about 1/2 of the threads. Is this normal or should it go nearly all the way?
I got a replacement accumulator/dryer. It has 3 schrader valves (it's a carquest). One is obviously for the switch and one if the low pressure connection, but what is the 3rd one for? My factory unit just has 2.