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First, it is illegal to mix refrigerants however what is done is done. Second, you need to run an identifier test on the car to see exactly how much R22 is in the system. If it is less than 2% then you are ok according to SAE J1771. If it is more, you have a problem. Finally, R22 tends to slowly degrade the seals, o-rings and other rubber components with the system. The amount of R22 directly relates to the amount of damage. Hope this helps.
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