any autozone or orileys has the kits
I've seen the combination R-134/Oil/Dye/Sealant cans at Wal-Mart. One can typically runs around $15 USD. I'd suggest one of the combination cans, and one or two of strictly coolant, depending on the required pressure. Kits including the required hose, pressure gauge, oil, sealant, refrigerant, and dye run $27 USD plus tax at Wal-Mart, as well.
The 1992 GMC Suburban came from the factory with R12 not R134. Unless it is has been converted to use R134 you cannot simply add R134. If it has been converted you need to have the leak fixed before adding anything. It is illegal to add refrigerant to any system without first repairing the leak. How much it will hold depends on how much leaked out.
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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