What kind of refrigerant does a 1993 Plymouth Acclaim use that has service valve on the compressor looks like tire valve?

A 1993 Plymouth Acclaim with a tire-valve-style service port on the A/C compressor used R-12 refrigerant. That type of service port was common with R-12 systems. It's crucial to remember that R-12 is no longer produced due to its ozone-depleting properties and should only be handled by certified technicians. If your system needs refrigerant, it should be converted to a compatible modern refrigerant like R-134a by a qualified professional.