R12 was used up until 1992. R134 Is what is used now, and you can even check to see if yours was converted from R12 To R134A
R-12
134a refrigerant
In a 1997 Ford Aerostar : Refrigerant 134a is used
An A/C shop will know. The leak must be repaired before adding refrigerant.
R-12
Should be R - 134a
r 134
R-12.
In a 1984 Ford E-150 : R12 ( if it hasn't been retrofitted )
all vehicles from 1994 and up in the U.S. are required by federal standards to use 134A refrigerant.
Freon is not used in automobiles any more. Refrigerant is used.
R-134A