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To convert a 1990 Miata's air conditioner from R12 to R134a, first, you need to recover and properly dispose of any remaining R12 refrigerant in the system. Next, replace the receiver-drier and any O-rings with R134a-compatible versions to prevent leaks. Then, evacuate the system to remove moisture and contaminants, and finally, recharge it with R134a refrigerant, typically using approximately 75% of the original R12 charge. It's advisable to have this process done by a professional to ensure proper handling and system performance.

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2mo ago

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