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.

[99gt3sge]

thanks for the responses, @Mi645 which resistor are you referring too? the one for the blower? also ill check the a/c with the gauges and see what psi its reading. its funny because on my swap i used the jdm harness and on my buddy's ride i use the 5s harness and his a/c works like a champ but i left his original compressor and i never discharged it. i will do these checks and ill let you guys knows what happens thanks again.