Well I just had a R12 to R134 conversion done a few days ago by a reputable shop and I went in my '84 FJ60, it blew cold as ice, 38.6 to be exact. I get in it this afternoon and it just blows hot fire in my face. I get under the hood and the AC comp. clutch is not engaging. I check the fuse and its fine, I jump the compressor to the battery and it engages. I have read a few threads and nothing is jumping out at me. I have a read a few things about the A/C amp, is there a way I can test that? And is there a relay under the dash or something that might have gone bad?