AC Question

[TheCougarine]

Hey guys, so I recently had my ac compressor go out and had my mechanic replace it and he said he converted it over to r134. Well its not cooled right since and I got to looking it over and what I understand to be the low pressure port on the passenger side is still an r12 port and the only r134 port is the one right above the compressor. So I'm wondering if this work was done correctly or does this seem weird to y'all as well? I've always been under the impression that the ac on the trucks was recharged at the port on the far passenger side not on top of the compressor and regardless shouldn't all of these ports be switched if it was converted? I'm wondering if this might be part of my problem since I had nice cold ac before the compressor went out. Was this work just not done correctly or am I missing something? Thanks in advance.