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With a refrigerant id tester. Go to a service center and have them perform a refrigerant purity test. Many R12 to R134a conversions did not actually have a complete conversion done, as the full conversion was very expensive, and one could get by with replacing some fittings and the compressor oil. Thus, the R12 schrader valves were often retained on these converted systems.

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11y ago
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Q: What if r12 was changed to r134 and adaptors were removed - how can you tell what freon is in it?
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