So I have an aftermarket Berh AC system in my 84 westy but the PO removed
the compressor. The fan in the dash still works. The hoses and at least one
related wire still go back to the engine compartment.  As far as I can tell
nothing else is missing.  Any idea how to go about getting this thing going
again? Are compressors pretty generic? Would any compressor that fits a
stock vanagon ac work?