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Vehicles manufactured before 1994 used R-12 as the refridgerant. R-12 and R-134A are not interchangable, so you need to first make sure your system is retrofitted with new parts, often a Compressor, Dryer and expansion valve, and has been fully flushed as the oil used with R-12 is not compatible with R-134A. It really should be done by a qualified professional, as you need to recover any R-12 left in the system, as it is very damaging to the ozone.

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17y ago
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Q: How do you add Freon R-134A to the air conditioner of 1990 Honda Accord LX?
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