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Is there a low pressure AC charging valve on the 1999 Aurora?

No, the 1999 Oldsmobile Aurora does not have a low-pressure AC charging valve in the traditional sense. The R-134a refrigerant system uses a Schrader valve (like those on tires) on the low-pressure side for accessing the system with charging equipment. It's not a valve you manually operate; it's accessed by the refrigerant charging machine.