Alright, this one has got me a little curious. First, let me make sure I remember this right: The 87s came with an R4 freon unit, right? the old stuff. okay, and the new stuff is called R12.. for some reason i remember something called R34; is my head just loopy on the exhaust? Anyway now, my compressor and evap core are shot. in fact, they've never worked. so I'm shopping around for rebuilds, and they're all R4. so far so good. but just now i read the label on the compressor, and it reads that uses R12?! taking closer note at the unit, it looks like it was definitely replaced... never really noticed it before... Damn, it seems everything i've had to replace or fix on this car something the guy that had her b4 me f*cked up trying to fix himself.... or a shady mech... that's why i do everything myself; damn mechs ALWAYS mess something up in my experience... anyway, can someone give me some advice on what system i should get? the blower motor label says R12 too, so I'm really just like, heck, Rwhatever as long as it works... Also, since i'm probably replacing the whole unit, should i just upgrade to the new stuff? compressors can work with all kinds of freon, right?