76 Scamp A/C

The kit came in and the compressor is rebuilt. There were a few pieces in the kit that I didn't know where they went, so yeah, there's a couple spare parts. It's just two o-rings that didn't fit anywhere and what looks like a big aluminum bushing. I filled it with ester oil, vacuumed for two hours and it held it for two hours. Charged up and it gets down to freezing in about three minutes at idle. But there is something that has confused me: I put in a single 12 ounce can and it seems to be working perfectly. I'm thinking that since it's a little cool out that that might have something to do with it, so I'm going to try it during the day to see if it's the same, but right now vent temperature is around 30 degrees. I'm also going to see if it still has pressure in it tomorrow as well. I had it on my truck that it held vacuum all day but it wouldn't hold pressure for more than a few hours.