Other Means Of Identification
Refrigerant R-134a is "milky" in appearance due to the mixture of refrigerant and lubricating oil. As the refrigerant and oil DO NOT exhibit a "clear" sight glass on a properly charged A/C system, most R-134a systems have no sight glass.
Ford Motor Co. vehicles using R-134a refrigerant may be identified by Gold colored A/C compressor clutch.