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I also drained the new compressor to be safe on how much I was putting in

Hi! Thanks for the Info. I didn't clean the system. Definitely didn't change the expansion valve but I might. I'm guessing most the oil leaked out since the old dryer was bone dry and only an ounce was in the compressor.

So the old compressor had a leak. I changed the compressor and dryer. Old dryer had no oil in it. Old compressor had 1oz. The system calls for 4.5oz so I put 3.5 in the compressor and 1 in the dryer. Vacuumed great. Added in 2.25lbs of r134a. Hood is off. Low pressure is 45 and high was 400 to...