all vehicles from 1994 and up in the U.S. are required by federal standards to use 134A refrigerant.
the solenoid on that year ford starter is on top of the starter itself. that starter is used on a wide variety of ford products.
134a is the refrigerant used by most vehicles made after 1995
134a refrigerant
The book on my 1998 Ford E350 says to use 5W-30.
134-a
r134
In a 1997 Ford Aerostar : Refrigerant 134a is used
R-12
mercron lv
An A/C shop will know. The leak must be repaired before adding refrigerant.
R134a.
R-12