ac compressor question on 1992 Ford Escort

how much freon does it take to fill the compressor completly?mine blows cool air but not enough it has the old r12 in it still.thanks ahead of time.

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1 answer
All vehicles will have a sticker in the engine compartment that will show the system capacity. I would take this to a repair shop and get an estimate on upgrading the system to the newer R134a refrigerant.