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Originally this car had R12 refrigerant. It may have since been updated to accept R134a. The coolant/radiator system is not part of the air conditioning system. But the hot antifreeze-coolant is used for the heating system...

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Q: Does the air conditioning system take r134 to recharge it and does coolant in radiator affect the air conditioning system on a 1991 Buick Park Avenue?
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