What do I need to do to convert my AC from R12 to R134. The info I recieved is only the fitting need to be replace and need to have system vac?

 

well, if you have to ask, you might want to bring it to a shop to do it, it cost around 150 bucks if everything is in good condition.

only a/c service shop have the vaccum, can't do it yourself and it's illegal to dump the feron to open air.