A/C PSI numbers

Outside temperature at the time was 85 degrees. I added 22 ounces what factory spec calls. I of course have since stopped on it until I can figure out what is causing the issue. It had a slow leak and eventually the air would work randomly before replacing parts. I would guess about a year and a half like this. At highway speed worked best. In heavy or slow traffic clutch would disengage and not come back on to cycle. If I turned the AC system off and wait a few minutes turn back on and clutch would engage but it would cut off at some point and still stop circulating. I really suspect the compressor because of length of time for leak.

Okay, will I need to replace the drier and expansion valve all over again? I am thinking no since system was never fully pressurized.

I noticed two different types of A/C compressors for the 2003 Frontier. One is for supercharge and the other one non-supercharged. The only difference I can see is the compressor for supercharge has a six groove pulley whereas the non-supercharged has a four groove pulley. Is this the only difference? Also mine has a heat switch so when I order a compressor need the heat switch? I would think so in order not to confuse the ECM computer. Thank you for the replies and been most helpful. It indeed is a bad compressor.