In a 1997 Ford Aerostar : Refrigerant 134a is used
The 1994 Ford Escort LX uses R-134a Freon. This type of refrigerant was used in all Ford Escorts from 1994 through 2002.
all vehicles from 1994 and up in the U.S. are required by federal standards to use 134A refrigerant.
R-12 R-134 started in 1994 IIRC on the Rangers
My girlfriend owns a 1994 323, and I am EPA certified for handling refrigerant. The 1994 uses R-12.
They are difficult and sometimes impossible to repair. Go to a salvage yard and buy a used horn. Cheapest way!