Will R-134A work on my R-12 A/c system

Question

So I have an old R-12 a/c system. Can I just add R-134A and would it work? I heard something like the compressor messes up. any help would be appreciated thanks.

Answer 1

No, it won't work.  The R12 and 134 use different types of oils and they are incompatible with each other.  

The various O-rings have to be changed out, along with the service valves; and the system needs to be flushed with a cleaner.

I'm almost certain you can still get the R12 recharged.

Answer 2

the R-12 MUST be remove and system evacuated, some changes must also be made. to use R-134A

Answer 3

It will work somewhat until it destroys the seals in the compressor.

Answer 4

not only is different oil required but 134 runs at higher pressures than R12 If at all possible repair the R12 system,bonus is it also runs colder usually.