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Take a look at your schrader valves. If the threads are on the outside, it's an R-12 system. However, it is possible that it may have been converted to an R-134A system by the previous owner (assuming you're not the original owner). You should have a shop test the refrigerant for type and purity level.

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Q: Does your 1991 535 BMW require R134 or R12 to recharge the air conditioner?
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