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I will answer as if you are converting from 92 to 93, even though you seem not to want to say why you are asking the question.
I'm installing '93 AC in an '86, using parts from '93's in junkyards.
The evaporator is the same from '92 to '93, as is the accumulator (but you'll want a new accumulator).
As others have said, the '93 condensor is definitely different. It does not appear to be thicker -- indeed, it may be thinner -- but you can identify it by the pipe that goes from side-to-side across the top.
Both the condensor's connections point downward; if that is different from the 92, then the pipe leading from the lower line may be different, too.
The two pieces of rubber hose in the system should be "barrier" types. The long one that I have (leads from the accumulator to the compressor) says "134a and PAG only" on it. I have not been able to find the other rubber line (from the compressor to the condensor) with that wording, so I suspect Volvo never took care of that issue.
I imagine the orifice tube is different, but I don't know.
Compressors? There is the lubrication issue (mineral oil with R-12 and PAG or POE with R-134a. I've been trying to get answers on PAG vs POE for a while now, without much success. I've concluded that POE will work, and that PAG might work better, but no one will tell me that. And PAG has its problems if the conversion is not done with lots of attention to getting ALL the mineral oil out -- except for a little perhaps left in the compressor, which you can't flush with solvent -- although you can run some PAG through it by hand in order to try to remove as much mineral oil as possible befopre the final fill
I'd be happy to hear others' views on the PAG/POE question. Facts seem short, so I suspect myth, economics or politics rule in that area.
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jds
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