[Hanuman]

I have 3 V8s.
The 1990 and 1991 cars with the older aircon system are both original R12 spec. Both need to be recharged.
The later 1993 car was Dealer converted to R134, but there is little information about what this entails. Is it possible to simply use later gas with few problems?

if anyone has been down this route, id be glad of your input.

Secondary question
The earlier type of compressor. My 1990 had a compressor clutch failure. Lots of smoke, noise, fumes. I ended up parking the car for a while as I couldn't get a tool to pull the clutch off. It appears to be M24x1.5 thread. Supposedly, clutches are easily obtained.
I've now swapped in a complete spare used compressor, and the car is sort of running again,
although I also have a brand new unit still sealed in a box.