The truck is a 2003 Silverado 2500HD
when I was a kid and my dad was driving it I had once asked him why his ac didn’t work and he said because it didn’t have any Freon in it, which leads to now I have the truck and I wanted to get the ac working I bought absolutely everything to redo the entire system. I pushed down on the service port valve just to check and it shot out some gas with reasonable pressure behind it, so apparently this truck held pressure for 20+ years. Once my boss checked charge and everything it was working and the clutch on the compressor burnt up. That’s probably why my dad took the belt off the compressor. But I put a new compressor on and a new high and low side line with the orifice tube. Vacuumed the system for something like 35-40 minutes and recharged it. I have a cheap Pittsburgh leak detector and sometimes it says it picking up refrigerant from the vents and sometimes it says it doesn’t, same with the smell sometimes when I get in the truck I kinda smell compressor oil and sometimes I don’t. So I don’t really know where to go from here