Should be R-134a.
r-134
R 12 was used when the 1992 Explorer came from the factory
I have a Motorcraft ( BXT65 - 650 ) Fords top of the line battery for the 1998 Ford Explorer
Hydraulic.
The preferred oil is 5 W - 30
SAE 5 W 30 - certified for gasoline engines
R134a
R134a
R134a
134A
R134a