You would fill the system with R-134a, using the low side port. The bad part is that your low side port is not easy to access. You will need to remove the passenger side wheel, remove the plastic wall and your port is there.
The 2006 Ford Focus will hold 26 ounces of R134a refrigerant. All engine models from 2000 to 2007 require the same amount.
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Why don't you ask a mechanic?
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All cars manufactured after 1993 were required to use R134a refrigerant.
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