All cars prior to 1995 used Freon R-12. Since then, most have switched to R-134a. The two can not be mixed. That should be marked on or near the fill port.
It's R-134 and it is not freon any more.
R134a
The amount of Freon you will need to fill your 2001 Mercury Sable air conditioning system is dependent upon how low the Freon level is. A recharge kit will have a gauge to tell you when the system is full.
R134a freon............
R134a
R134a
R134a refrigerant.
The 1.9 liter and 1.8 liter four cylinder engines used in the 1993 Mercury Tracer are NON - INTERFERENCE engines according to the Gates website ( they make timing belts etcetera )
R-134a is used in all vehicles 1995 and later.
134-A
Tie wraps can be used to replace a stock radio wiring harness in a 1991 Mercury Tracer. The wires can be replaced with other radio wire from an automotive parts store and the tie wrap can hold them together.