a/c problem, 3sge swap a/c Options

[99gt3sge]

well before i swapped my 3s my a/c was working nice but the compressor was making noise, so naturally when i swapped i used the jdm compressor and ever since then i charged the system and now only works when the car is cold or when i'm on the highway. on stop and go it stops working have any of you guys experience this? the only thing I'm guessing that the compressor that i'm using might be for r12 and my car uses 134 since it's a 99.

[Bitter]

Good, so get it pulled to a complete vacuum, let it sit at vacuum for a while, then charge it to the proper weight, and run the engine till it's hot and hold a fast idle at 2500 rpm and see what's going wrong. It could even be that the AC fan isn't cycling on! That will be easy to see happening, you can verify it's a heat over pressure by spraying the condenser down with a garden hose and noting the drop in high side pressure and the increase in cooling in the car.