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Other Means Of Identification

Refrigerant R-134a, when viewed through a sight glass, may have a "milky" 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.

Audi, Mercedes-Benz and Volkswagen use Green bands/labels on condenser, refrigerant lines, receiver-drier and expansion valve. On Lexus A/C systems, hoses and line connectors have a groove, a White line and "R-134a" marked on them. See Fig 1.

Fig 1: Identifying R-134a Hose & Line Connectors (Lexus)
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