Convert to R134A
 

I have no A/C or heat componets in my 79 T/A. What do I need for A/C to use R134A I know compressor what else can I use anything from the R12 system?

Thanks,

All the original AC components can be reused.
Replace all hoses and "O" rings with R134 compatible.
The metal fittings on the hoses can be reused.