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R134a
R-12 unless it has been converted over to R-134a.
According to the 2001 Mercury Sable Owner Guide : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A )
Unless it has been converted over to R134 it came with R12. I suggest you convert it to R134a. R12 is very expensive.
What kind of freon for bmw 323i 2001
A 1998 Mercury would use R134a refrigerant.
R134a
R134a
R134a
Mercon V
5W-30
134A