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First, your 1998 Mercury contains no Freon which is R12. It contains R-134 refrigerant. You add R134 at the low pressure port. But the fact that you need to add R134 indicates you have a leak. It is illegal to add refrigerant to a system with a leak without first repairing the leak. Seek professional help and have the leak repaired.

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15y ago
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Q: Where do you put in freon in a 1998 grand marquis?
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