Passage of the Clean Air Act. R-12 depletes the ozone - R-134a does not.
You can't, you need to have the system switched over to use refrigerants R12a or R134a, because the refrigerant R12 is now banned.
No you don't have to change the A/C Compressor.
R134a
It was built with R12, can be coverted to R134aIt was built with R12, can be coverted to R134a
It was built with r12. It can be retrofitted to R134a.It was built with r12. It can be retrofitted to R134a.
Was built with R12, can be retrofitted ot R134a.Was built with R12, can be retrofitted ot R134a.
No. They use R22 or R410A. Cars use R12 (before 1993) and R134A (after 1993). You cannot mix them together.
Would have been built for R12, can be converted to R134a.
R134a.
R12 was in use up until the 90's when R134A was introduced. I believe R12 was phased out at the end of 94, And R134A took it's place from 95 on. I hope that's the answer you're looking for.
2 pounds of r134a. Not r12.
An R12 system must be retrofitted to be made compatible with R-134a.