W123 (1984) AC parts list...
 

First, my system was an original R12. I nearly swapped over to 134A but after readin' here, seems that it's not a good idea is the consensus here!

I did some searching and have a semi-list of parts needed...

New compressor, R4 style. Rebuilt is junk.
New dryer/accumulator
New hoses
New expansion valve

Aside from that, what am I missing? I plan to flush the system and evac it. All new o-rings. My bud has the EPA cert paperwork so I won't get price gouged on my R12 thankfully! Is the condensor mkay to flush out since it's been sitting?

Where is the best place to get these hoses?

I always replace the shrader valves because they are cheap ..

Pressure switch on the dryer

You should be able to find a local shop to rebuild the big diameter hoses.. Condensor to dryer and dryer/evap are cheap.

For a W123, I think it's a wise decision to stay R12. Make sure the radiator fan is working...

Michael

Ideas on how much less it'd cost to rebuild those hoses as opposed to purchasing new ones?

Does a new dryer come with that pressure switch?

I wanna only do this once... :D

Why are you replacing all these components? Did you have catastrophic compressor failure? Are your hoses leaking?

Have a great day,